diff --git a/source/animated_sprite.cpp b/source/animated_sprite.cpp
index 773ffc0..493fd13 100644
--- a/source/animated_sprite.cpp
+++ b/source/animated_sprite.cpp
@@ -1,6 +1,8 @@
 #include "animated_sprite.h"
+#include <algorithm> // for copy
 #include <fstream>	 // for basic_ostream, operator<<, basic_istream, basic...
 #include <iostream>	 // for cout
+#include <iterator>	 // for back_insert_iterator, back_inserter
 #include <sstream>	 // for basic_stringstream
 #include "texture.h" // for Texture
 
diff --git a/source/animated_sprite.h b/source/animated_sprite.h
index 603a822..607a380 100644
--- a/source/animated_sprite.h
+++ b/source/animated_sprite.h
@@ -2,11 +2,11 @@
 
 #include <SDL2/SDL_rect.h>   // for SDL_Rect
 #include <SDL2/SDL_stdinc.h> // for Uint8
-#include <string>            // for string, basic_string
+#include <memory>            // for shared_ptr
+#include <string>            // for string
 #include <vector>            // for vector
 #include "moving_sprite.h"   // for MovingSprite
-#include "texture.h"
-#include <memory>
+class Texture;
 
 struct Animation
 {
@@ -37,7 +37,7 @@ protected:
 
 public:
     // Constructor
-    explicit AnimatedSprite(std::shared_ptr<Texture> texture = nullptr, const std::string &file = std::string(), std::vector<std::string>* buffer = nullptr);
+    explicit AnimatedSprite(std::shared_ptr<Texture> texture = nullptr, const std::string &file = std::string(), std::vector<std::string> *buffer = nullptr);
     explicit AnimatedSprite(const AnimatedFile *animation);
 
     // Destructor
diff --git a/source/background.cpp b/source/background.cpp
index 1c4f2fe..231b3b6 100644
--- a/source/background.cpp
+++ b/source/background.cpp
@@ -1,10 +1,12 @@
 #include "background.h"
-#include <SDL2/SDL_blendmode.h> // for SDL_BLENDMODE_BLEND
-#include <SDL2/SDL_pixels.h>    // for SDL_PIXELFORMAT_RGBA8888
-#include <algorithm>            // for max, min
-#include <string>               // for basic_string
-#include "asset.h"              // for Asset
-#include "param.h"              // for param
+#include <SDL2/SDL_blendmode.h>  // for SDL_BLENDMODE_BLEND
+#include <SDL2/SDL_pixels.h>     // for SDL_PIXELFORMAT_RGBA8888
+#include <algorithm>             // for clamp, max
+#include "asset.h"               // for Asset
+#include "moving_sprite.h"       // for MovingSprite
+#include "param.h"               // for param
+#include "sprite.h"              // for Sprite
+#include "texture.h"             // for Texture
 
 // Constructor
 Background::Background(SDL_Renderer *renderer)
diff --git a/source/background.h b/source/background.h
index 1c943de..0d85efe 100644
--- a/source/background.h
+++ b/source/background.h
@@ -1,12 +1,12 @@
 #pragma once
 
-#include <SDL2/SDL_rect.h>   // for SDL_Rect
-#include <SDL2/SDL_render.h> // for SDL_Renderer, SDL_Texture
-#include "utils.h"           // for Color
-#include "moving_sprite.h"
-#include "sprite.h"
-#include "texture.h"
-#include <memory>
+#include <SDL2/SDL_rect.h>    // for SDL_Rect
+#include <SDL2/SDL_render.h>  // for SDL_Renderer, SDL_Texture
+#include <memory>             // for unique_ptr, shared_ptr
+#include "utils.h"            // for Color
+class MovingSprite;
+class Sprite;
+class Texture;
 
 /*
     Esta clase es la encargada de dibujar el fondo que aparece durante la sección
diff --git a/source/balloon_formations.cpp b/source/balloon_formations.cpp
index 0c22096..08fc9cc 100644
--- a/source/balloon_formations.cpp
+++ b/source/balloon_formations.cpp
@@ -428,7 +428,6 @@ void BalloonFormations::initBalloonFormations()
 	// #24 - Treinta enemigos BALLOON1. Del centro hacia los extremos. Juntos. Simetricos
 	j = 24;
 	balloon_formation_[j].number_of_balloons = 30;
-	inc_x = 0;
 	inc_time = 5;
 	for (int i = 0; i < balloon_formation_[j].number_of_balloons; i++)
 	{
diff --git a/source/bullet.cpp b/source/bullet.cpp
index a759576..f2b1d47 100644
--- a/source/bullet.cpp
+++ b/source/bullet.cpp
@@ -3,7 +3,6 @@
 #include "sprite.h" // for Sprite
 #include <memory>   // for std::unique_ptr
 
-// Constantes evaluables en tiempo de compilación
 constexpr int BULLET_WIDTH = 12;
 constexpr int BULLET_HEIGHT = 12;
 constexpr int BULLET_VELY = -3;
@@ -23,10 +22,9 @@ Bullet::Bullet(int x, int y, BulletType kind, bool powered_up, int owner, SDL_Re
       owner_(owner),
       play_area_(play_area)
 {
-    vel_x_ = (kind_ == BulletType::LEFT)    ? BULLET_VELX_LEFT
-             : (kind_ == BulletType::RIGHT) ? BULLET_VELX_RIGHT
-                                            : 0;
-    
+    vel_x_ = (kind_ == BulletType::LEFT) ? BULLET_VELX_LEFT : (kind_ == BulletType::RIGHT) ? BULLET_VELX_RIGHT
+                                                                                           : 0;
+
     auto sprite_offset = powered_up ? 3 : 0;
     auto kind_index = static_cast<int>(kind);
     sprite_->setSpriteClip((kind_index + sprite_offset) * width_, 0, sprite_->getWidth(), sprite_->getHeight());
@@ -67,12 +65,12 @@ BulletMoveStatus Bullet::move()
 
 bool Bullet::isEnabled() const
 {
-    return kind_ != BulletType::NULL_TYPE;
+    return kind_ != BulletType::NONE;
 }
 
 void Bullet::disable()
 {
-    kind_ = BulletType::NULL_TYPE;
+    kind_ = BulletType::NONE;
 }
 
 int Bullet::getPosX() const
diff --git a/source/bullet.h b/source/bullet.h
index c71fced..13d960d 100644
--- a/source/bullet.h
+++ b/source/bullet.h
@@ -13,7 +13,7 @@ enum class BulletType
 	UP,
 	LEFT,
 	RIGHT,
-	NULL_TYPE
+	NONE
 };
 
 // Enumeración para los resultados del movimiento de la bala
diff --git a/source/director.cpp b/source/director.cpp
index 32dd598..4fb96de 100644
--- a/source/director.cpp
+++ b/source/director.cpp
@@ -41,7 +41,7 @@
 #endif
 
 // Constructor
-Director::Director(int argc, char *argv[])
+Director::Director(int argc, const char *argv[])
 {
 #ifdef RECORDING
 	section::name = section::Name::GAME;
@@ -160,8 +160,8 @@ void Director::initInput()
 	Input::get()->bindKey(InputType::RESET, SDL_SCANCODE_F10);
 
 	// Asigna botones a inputs
-	const int numGamePads = Input::get()->getNumControllers();
-	for (int i = 0; i < numGamePads; ++i)
+	const int num_gamepads = Input::get()->getNumControllers();
+	for (int i = 0; i < num_gamepads; ++i)
 	{
 		// Mando - Movimiento del jugador
 		Input::get()->bindGameControllerButton(i, InputType::UP, SDL_CONTROLLER_BUTTON_DPAD_UP);
@@ -188,7 +188,7 @@ void Director::initInput()
 	}
 
 	// Mapea las asignaciones a los botones desde el archivo de configuración, si se da el caso
-	for (int i = 0; i < numGamePads; ++i)
+	for (int i = 0; i < num_gamepads; ++i)
 		for (int index = 0; index < (int)options.controller.size(); ++index)
 			if (Input::get()->getControllerName(i) == options.controller[index].name)
 			{
@@ -200,7 +200,7 @@ void Director::initInput()
 			}
 
 	// Asigna botones a inputs desde otros inputs
-	for (int i = 0; i < numGamePads; ++i)
+	for (int i = 0; i < num_gamepads; ++i)
 	{
 		Input::get()->bindGameControllerButton(i, InputType::EXIT, InputType::START);
 		Input::get()->bindGameControllerButton(i, InputType::RESET, InputType::FIRE_CENTER);
@@ -213,7 +213,7 @@ void Director::initInput()
 	}
 
 	// Guarda las asignaciones de botones en las opciones
-	for (int i = 0; i < numGamePads; ++i)
+	for (int i = 0; i < num_gamepads; ++i)
 	{
 		options.controller[i].name = Input::get()->getControllerName(i);
 		for (int j = 0; j < (int)options.controller[i].inputs.size(); ++j)
@@ -484,7 +484,7 @@ void Director::loadParams(const std::string &file_path)
 }
 
 // Comprueba los parametros del programa
-void Director::checkProgramArguments(int argc, char *argv[])
+void Director::checkProgramArguments(int argc, const char *argv[])
 {
 	// Establece la ruta del programa
 	executable_path_ = argv[0];
@@ -492,7 +492,7 @@ void Director::checkProgramArguments(int argc, char *argv[])
 	// Valores por defecto
 	param_file_argument_.clear();
 
-	// Comprueba el resto de parametros
+	// Comprueba el resto de parámetros
 	for (int i = 1; i < argc; ++i)
 	{
 		if (strcmp(argv[i], "--320x240") == 0)
@@ -566,17 +566,15 @@ void Director::createSystemFolder(const std::string &folder)
 void Director::loadSounds()
 {
 	// Obtiene la lista con las rutas a los ficheros de sonidos
-	std::vector<std::string> list = Asset::get()->getListByType(AssetType::SOUND);
+	auto list = Asset::get()->getListByType(AssetType::SOUND);
 	sounds_.clear();
 
 	for (const auto &l : list)
 	{
-		const size_t lastIndex = l.find_last_of("/") + 1;
-		const std::string name = l.substr(lastIndex, std::string::npos);
-		SoundFile temp;
-		temp.name = name;					 // Añade el nombre del fichero
-		temp.file = JA_LoadSound(l.c_str()); // Carga el fichero de audio
-		sounds_.push_back(temp);
+		auto last_index = l.find_last_of('/') + 1;
+		auto name = l.substr(last_index);
+
+		sounds_.emplace_back(SoundFile{name, JA_LoadSound(l.c_str())});
 	}
 }
 
@@ -584,78 +582,69 @@ void Director::loadSounds()
 void Director::loadMusics()
 {
 	// Obtiene la lista con las rutas a los ficheros musicales
-	std::vector<std::string> list = Asset::get()->getListByType(AssetType::MUSIC);
+	auto list = Asset::get()->getListByType(AssetType::MUSIC);
 	musics_.clear();
 
 	for (const auto &l : list)
 	{
-		const size_t lastIndex = l.find_last_of("/") + 1;
-		const std::string name = l.substr(lastIndex, std::string::npos);
-		MusicFile temp;
-		temp.name = name;					 // Añade el nombre del fichero
-		temp.file = JA_LoadMusic(l.c_str()); // Carga el fichero de audio
-		musics_.push_back(temp);
+		auto last_index = l.find_last_of('/') + 1;
+		auto name = l.substr(last_index);
+
+		musics_.emplace_back(MusicFile{name, JA_LoadMusic(l.c_str())});
 	}
 }
 
 // Ejecuta la sección con el logo
 void Director::runLogo()
 {
-	auto logo = new Logo();
+	auto logo = std::make_unique<Logo>();
 	logo->run();
-	delete logo;
 }
 
 // Ejecuta la sección con la secuencia de introducción
 void Director::runIntro()
 {
-	auto intro = new Intro(getMusic(musics_, "intro.ogg"));
+	auto intro = std::make_unique<Intro>(getMusic(musics_, "intro.ogg"));
 	intro->run();
-	delete intro;
 }
 
-// Ejecuta la sección con el titulo del juego
+// Ejecuta la sección con el título del juego
 void Director::runTitle()
 {
-	auto title = new Title(getMusic(musics_, "title.ogg"));
+	auto title = std::make_unique<Title>(getMusic(musics_, "title.ogg"));
 	title->run();
-	delete title;
 }
 
 // Ejecuta la sección donde se juega al juego
 void Director::runGame()
 {
-	const auto playerID = section::options == section::Options::GAME_PLAY_1P ? 1 : 2;
-	constexpr auto currentStage = 0;
-	auto game = new Game(playerID, currentStage, GAME_MODE_DEMO_OFF, getMusic(musics_, "playing.ogg"));
+	const auto player_id = section::options == section::Options::GAME_PLAY_1P ? 1 : 2;
+	constexpr auto current_stage = 0;
+	auto game = std::make_unique<Game>(player_id, current_stage, GAME_MODE_DEMO_OFF, getMusic(musics_, "playing.ogg"));
 	game->run();
-	delete game;
 }
 
 // Ejecuta la sección donde se muestran las instrucciones
 void Director::runInstructions()
 {
-	auto instructions = new Instructions(getMusic(musics_, "title.ogg"));
+	auto instructions = std::make_unique<Instructions>(getMusic(musics_, "title.ogg"));
 	instructions->run();
-	delete instructions;
 }
 
 // Ejecuta la sección donde se muestra la tabla de puntuaciones
 void Director::runHiScoreTable()
 {
-	auto hiScoreTable = new HiScoreTable(getMusic(musics_, "title.ogg"));
-	hiScoreTable->run();
-	delete hiScoreTable;
+	auto hi_score_table = std::make_unique<HiScoreTable>(getMusic(musics_, "title.ogg"));
+	hi_score_table->run();
 }
 
 // Ejecuta el juego en modo demo
 void Director::runDemoGame()
 {
-	const auto playerID = (rand() % 2) + 1;
-	constexpr auto currentStage = 0;
-	auto game = new Game(playerID, currentStage, GAME_MODE_DEMO_ON, nullptr);
+	const auto player_id = (rand() % 2) + 1;
+	constexpr auto current_stage = 0;
+	auto game = std::make_unique<Game>(player_id, current_stage, GAME_MODE_DEMO_ON, nullptr);
 	game->run();
-	delete game;
 }
 
 int Director::run()
@@ -702,8 +691,8 @@ int Director::run()
 		}
 	}
 
-	const int returnCode = section::options == section::Options::QUIT_NORMAL ? 0 : 1;
-	return returnCode;
+	const int return_code = section::options == section::Options::QUIT_NORMAL ? 0 : 1;
+	return return_code;
 }
 
 // Obtiene una fichero a partir de un lang::Code
diff --git a/source/director.h b/source/director.h
index 775ec4b..79afd2d 100644
--- a/source/director.h
+++ b/source/director.h
@@ -46,7 +46,7 @@ private:
 	void loadMusics();
 
 	// Comprueba los parametros del programa
-	void checkProgramArguments(int argc, char *argv[]);
+	void checkProgramArguments(int argc, const char *argv[]);
 
 	// Crea la carpeta del sistema donde guardar datos
 	void createSystemFolder(const std::string &folder);
@@ -77,7 +77,7 @@ private:
 
 public:
 	// Constructor
-	Director(int argc, char *argv[]);
+	Director(int argc, const char *argv[]);
 
 	// Destructor
 	~Director();
diff --git a/source/logo.cpp b/source/logo.cpp
index 2c11575..4c24398 100644
--- a/source/logo.cpp
+++ b/source/logo.cpp
@@ -114,12 +114,12 @@ void Logo::updateJAILGAMES()
 	{
 		for (int i = 0; i < (int)jail_sprite_.size(); ++i)
 		{
-			if (jail_sprite_[i]->getPosX() != dest_.x)
+			if (jail_sprite_[i]->getIntPosX() != dest_.x)
 			{
 				if (i % 2 == 0)
 				{
 					jail_sprite_[i]->incPosX(-SPEED);
-					if (jail_sprite_[i]->getPosX() < dest_.x)
+					if (jail_sprite_[i]->getIntPosX() < dest_.x)
 					{
 						jail_sprite_[i]->setPosX(dest_.x);
 					}
@@ -127,7 +127,7 @@ void Logo::updateJAILGAMES()
 				else
 				{
 					jail_sprite_[i]->incPosX(SPEED);
-					if (jail_sprite_[i]->getPosX() > dest_.x)
+					if (jail_sprite_[i]->getIntPosX() > dest_.x)
 					{
 						jail_sprite_[i]->setPosX(dest_.x);
 					}
diff --git a/source/main.cpp b/source/main.cpp
index d075286..137b7e0 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -7,25 +7,23 @@ Actualizando a la versión "Arcade Edition" en 08/05/2024
 
 */
 
-#include <iostream>    // for basic_ostream, char_traits, operator<<, cout
-#include <string>      // for basic_string, operator<<, string
-#include "director.h"  // for Director
+#include <iostream> // for basic_ostream, char_traits, operator<<, cout
+#include <string>   // for basic_string, operator<<, string
+#include <memory>
+#include "director.h" // for Director
 
 int main(int argc, char *argv[])
 {
-	std::cout << "Game start" << std::endl;
+    std::cout << "Game start" << std::endl;
 
-	// Crea el objeto Director
-	Director *director = new Director(argc, argv);
+    // Crea el objeto Director
+    auto director = std::make_unique<Director>(argc, const_cast<const char **>(argv));
 
-	// Bucle principal
-	const auto exit = director->run();
+    // Bucle principal
+    const auto exit = director->run();
 
-	// Destruye el objeto Director
-	delete director;
+    const auto endType = exit == 0 ? "keyboard" : "controller";
+    std::cout << "\nGame end with " << endType << std::endl;
 
-	const auto endType = exit == 0 ? "keyboard" : "controller";
-	std::cout << "\nGame end with " << endType << std::endl;
-
-	return exit;
+    return exit;
 }
diff --git a/source/param.cpp b/source/param.cpp
index 59c6165..e4a9aa0 100644
--- a/source/param.cpp
+++ b/source/param.cpp
@@ -195,7 +195,7 @@ void loadParamsFromFile(const std::string &file_path)
 		auto comment_pos = line.find('#');
 		if (comment_pos != std::string::npos)
 		{
-			line = line.substr(0, comment_pos);
+			line.resize(comment_pos);
 		}
 
 		// Usa un stream para separar palabras
diff --git a/source/scoreboard.h b/source/scoreboard.h
index 1500388..f4c948d 100644
--- a/source/scoreboard.h
+++ b/source/scoreboard.h
@@ -103,7 +103,7 @@ private:
 	// [SINGLETON] Ahora el constructor y el destructor son privados
 
 	// Constructor
-	Scoreboard(SDL_Renderer *renderer);
+	explicit Scoreboard(SDL_Renderer *renderer);
 
 	// Destructor
 	~Scoreboard();
diff --git a/source/sprite.cpp b/source/sprite.cpp
index 60b26d7..92cb7e5 100644
--- a/source/sprite.cpp
+++ b/source/sprite.cpp
@@ -21,13 +21,13 @@ void Sprite::render()
 }
 
 // Obten el valor de la variable
-int Sprite::getPosX() const
+int Sprite::getIntPosX() const
 {
 	return pos_.x;
 }
 
 // Obten el valor de la variable
-int Sprite::getPosY() const
+int Sprite::getIntPosY() const
 {
 	return pos_.y;
 }
diff --git a/source/sprite.h b/source/sprite.h
index cc2fffd..bd5300a 100644
--- a/source/sprite.h
+++ b/source/sprite.h
@@ -26,8 +26,8 @@ public:
     virtual void render();
 
     // Obten el valor de la variable
-    int getPosX() const;
-    int getPosY() const;
+    int getIntPosX() const;
+    int getIntPosY() const;
     int getWidth() const;
     int getHeight() const;
 
diff --git a/source/text.cpp b/source/text.cpp
index af93bcf..de36ea8 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -81,7 +81,7 @@ TextFile LoadTextFile(std::string file_path)
 }
 
 // Constructor
-Text::Text(std::string bitmap_file, std::string text_file, SDL_Renderer *renderer)
+Text::Text(const std::string &bitmap_file, const std::string &text_file, SDL_Renderer *renderer)
 {
 	// Carga los offsets desde el fichero
 	auto tf = LoadTextFile(text_file);
@@ -105,7 +105,7 @@ Text::Text(std::string bitmap_file, std::string text_file, SDL_Renderer *rendere
 }
 
 // Constructor
-Text::Text(std::string text_file, std::shared_ptr<Texture> texture)
+Text::Text(const std::string &text_file, std::shared_ptr<Texture> texture)
 {
 	// Carga los offsets desde el fichero
 	auto tf = LoadTextFile(text_file);
diff --git a/source/text.h b/source/text.h
index ae68315..d87cf74 100644
--- a/source/text.h
+++ b/source/text.h
@@ -44,8 +44,8 @@ private:
 
 public:
 	// Constructor
-	Text(std::string bitmap_file, std::string text_file, SDL_Renderer *renderer);
-	Text(std::string text_file, std::shared_ptr<Texture> texture);
+	Text(const std::string &bitmap_file, const std::string &text_file, SDL_Renderer *renderer);
+	Text(const std::string &text_file, std::shared_ptr<Texture> texture);
 	Text(TextFile *text_file, std::shared_ptr<Texture> texture);
 
 	// Destructor
diff --git a/source/texture.cpp b/source/texture.cpp
index a661bc5..50b941e 100644
--- a/source/texture.cpp
+++ b/source/texture.cpp
@@ -56,13 +56,13 @@ Texture::~Texture()
 // Carga una imagen desde un fichero
 bool Texture::loadFromFile(const std::string &path)
 {
-	const std::string file_name = path.substr(path.find_last_of("\\/") + 1);
 	int req_format = STBI_rgb_alpha;
 	int width, height, orig_format;
 	unsigned char *data = stbi_load(path.c_str(), &width, &height, &orig_format, req_format);
 	if (!data)
 	{
 #ifdef VERBOSE
+		const std::string file_name = path.substr(path.find_last_of("\\/") + 1);
 		std::cout << "Loading image failed: " << stbi_failure_reason() << std::endl;
 #endif
 		exit(1);
@@ -70,6 +70,7 @@ bool Texture::loadFromFile(const std::string &path)
 	else
 	{
 #ifdef VERBOSE
+		const std::string file_name = path.substr(path.find_last_of("\\/") + 1);
 		std::cout << "Image loaded: " << file_name << std::endl;
 #endif
 	}
@@ -96,7 +97,7 @@ bool Texture::loadFromFile(const std::string &path)
 	SDL_Texture *newTexture = nullptr;
 
 	// Carga la imagen desde una ruta específica
-	auto loadedSurface = SDL_CreateRGBSurfaceWithFormatFrom(static_cast<void*>(data), width, height, depth, pitch, pixel_format);
+	auto loadedSurface = SDL_CreateRGBSurfaceWithFormatFrom(static_cast<void *>(data), width, height, depth, pitch, pixel_format);
 	if (loadedSurface == nullptr)
 	{
 #ifdef VERBOSE
@@ -137,9 +138,9 @@ bool Texture::createBlank(int width, int height, SDL_PixelFormatEnum format, SDL
 	texture_ = SDL_CreateTexture(renderer_, format, access, width, height);
 	if (!texture_)
 	{
-		#ifdef VERBOSE
+#ifdef VERBOSE
 		std::cout << "Unable to create blank texture! SDL Error: " << SDL_GetError() << std::endl;
-		#endif
+#endif
 	}
 	else
 	{
@@ -312,7 +313,7 @@ void Texture::flipSurface()
 	// Vuelca los datos
 	Uint32 *pixels;
 	int pitch;
-	SDL_LockTexture(texture_, nullptr, reinterpret_cast<void**>(&pixels), &pitch);
+	SDL_LockTexture(texture_, nullptr, reinterpret_cast<void **>(&pixels), &pitch);
 	for (int i = 0; i < width_ * height_; ++i)
 	{
 		pixels[i] = palettes_[paletteIndex_][surface_->data[i]];
@@ -344,7 +345,7 @@ std::vector<Uint32> Texture::loadPal(const std::string &file_name)
 	fread(buffer, size, 1, f);
 	fclose(f);
 
-	auto pal = LoadPalette(buffer);
+	const auto pal = LoadPalette(buffer);
 	if (!pal)
 	{
 		return palette;
@@ -361,9 +362,9 @@ std::vector<Uint32> Texture::loadPal(const std::string &file_name)
 }
 
 // Añade una paleta a la lista
-void Texture::addPalette(std::string path)
+void Texture::addPalette(const std::string &path)
 {
-	palettes_.push_back(loadPal(path.c_str()));
+	palettes_.push_back(loadPal(path));
 	setPaletteColor((int)palettes_.size() - 1, 0, 0x00000000);
 }
 
diff --git a/source/texture.h b/source/texture.h
index 361bcee..990294e 100644
--- a/source/texture.h
+++ b/source/texture.h
@@ -91,7 +91,7 @@ public:
     SDL_Texture *getSDLTexture();
 
     // Añade una paleta a la lista
-    void addPalette(std::string path);
+    void addPalette(const std::string &path);
 
     // Establece un color de la paleta
     void setPaletteColor(int palette, int index, Uint32 color);
diff --git a/source/writer.cpp b/source/writer.cpp
index 682762e..c798b74 100644
--- a/source/writer.cpp
+++ b/source/writer.cpp
@@ -79,7 +79,7 @@ void Writer::setKerning(int value)
 }
 
 // Establece el valor de la variable
-void Writer::setCaption(std::string text)
+void Writer::setCaption(const std::string &text)
 {
 	caption_ = text;
 	lenght_ = text.length();
diff --git a/source/writer.h b/source/writer.h
index ba03ce4..5f4e556 100644
--- a/source/writer.h
+++ b/source/writer.h
@@ -48,7 +48,7 @@ public:
 	void setKerning(int value);
 
 	// Establece el valor de la variable
-	void setCaption(std::string text);
+	void setCaption(const std::string &text);
 
 	// Establece el valor de la variable
 	void setSpeed(int value);