diff --git a/15_color.txt b/15_sdl_color.txt
similarity index 100%
rename from 15_color.txt
rename to 15_sdl_color.txt
diff --git a/16_image.txt b/16_sdl_image.txt
similarity index 100%
rename from 16_image.txt
rename to 16_sdl_image.txt
diff --git a/17_renderer.txt b/17_sdl_renderer.txt
similarity index 100%
rename from 17_renderer.txt
rename to 17_sdl_renderer.txt
diff --git a/18_texture.txt b/18_sdl_texture.txt
similarity index 100%
rename from 18_texture.txt
rename to 18_sdl_texture.txt
diff --git a/19_sprite.txt b/19_sdl_sprite.txt
similarity index 100%
rename from 19_sprite.txt
rename to 19_sdl_sprite.txt
diff --git a/20_camera.txt b/20_sdl_camera.txt
similarity index 100%
rename from 20_camera.txt
rename to 20_sdl_camera.txt