diff --git a/assets-cg/converters.py b/assets-cg/converters.py
index 884df81..db411d3 100644
--- a/assets-cg/converters.py
+++ b/assets-cg/converters.py
@@ -22,6 +22,7 @@ def convert_map(input, output, params, target):
 	with open(input, "r") as jsonData:
 		data = json.load(jsonData)
 
+	#find the tileset using the location of the input
 	tileset = open(input.replace(input.split("/")[-1], "tileset.json"), "r")
 	data_tileset = json.load(tileset)
 	tileset.close()
@@ -29,6 +30,7 @@ def convert_map(input, output, params, target):
 	tile_value = {}
 	info_map = bytearray()
 
+	#create a dictionnary between tile-type
 	for i in data_tileset["tiles"]:
 		try:
 			id = i["id"]+1
@@ -51,6 +53,7 @@ def convert_map(input, output, params, target):
 		except KeyError:
 			pass
 
+	#Extract from the json the width, height and layers of the map
 	w = data["layers"][0]["width"]
 	h = data["layers"][0]["height"]
 	nblayer = len(data["layers"])
@@ -59,7 +62,9 @@ def convert_map(input, output, params, target):
 	o += fxconv.u32(w) + fxconv.u32(h) + fxconv.u32(nblayer)
 	o += fxconv.ref("img_tileset")
 
+	#To preserve performance, max 2 layers
 	if(nblayer <= 2):
+		#generate the array of tiles from the layer
 		for i in range(nblayer):
 			tiles = data["layers"][i]["data"]
 
@@ -69,6 +74,7 @@ def convert_map(input, output, params, target):
 			o += fxconv.ref(byte_tiles)
 
 		#generation of the collision map (take the maximum of the layer except for bridges)
+		#bridges is always walkable
 		for x in range(w*h):
 			value1 = tile_value.get(data["layers"][0]["data"][x])
 			if(nblayer >= 2):
@@ -81,10 +87,10 @@ def convert_map(input, output, params, target):
 				if value1 == TILE_BRIDGE: value1 = TILE_AIR
 				info_map += bytearray(fxconv.u16(value1))
 		o += fxconv.ref(info_map)
-
 	else:
 		raise fxconv.FxconvError(f"There is too much layer ! {nblayer} found for a max of 2")
 
+	#generate !
 	fxconv.elf(o, output, "_" + params["name"], **target)
 
 def convert_character(input, output, params, target):
@@ -93,8 +99,7 @@ def convert_character(input, output, params, target):
 
 	o = fxconv.ObjectData()
 	o += fxconv.u32((int)(file[0])) + fxconv.u32((int)(file[1]))
-	o += fxconv.ref(bytes(file[2], 'utf-8') + bytes(1))
+	o += fxconv.ref(bytes(file[2], 'utf-8') + bytes(1)) #bytes(1) is necessary to end a char
 	o += fxconv.ref(bytes(file[3], 'utf-8') + bytes(1))
 	
-
 	fxconv.elf(o, output, "_" + params["name"], **target)
\ No newline at end of file
diff --git a/include/animation.h b/include/animation.h
index d545d81..cb8ec8e 100644
--- a/include/animation.h
+++ b/include/animation.h
@@ -33,6 +33,9 @@ struct anim_data
     int duration;
 };
 
+/*draw the frame*/
 void dframe(int x, int y, struct anim_frame const frame);
+/*animation for player walking*/
 int anim_player_walking(struct anim_data *data, int init);
+/*animation for player doing nothing*/
 int anim_player_idle(struct anim_data *data, int init);
\ No newline at end of file
diff --git a/include/character.h b/include/character.h
index 889926b..4bf4bbd 100644
--- a/include/character.h
+++ b/include/character.h
@@ -9,6 +9,9 @@ struct character {
 	char *dialog;
 };
 
+/*draw the dialog of a specified character*/
 void draw_dialog(struct character *character);
+/*find the character using the player's position*/
 struct character* get_character_xy(struct character *characters[], int x, int y);
+/*get the characters for a specified map*/
 struct character** get_map_characters(int id);
\ No newline at end of file
diff --git a/include/engine.h b/include/engine.h
index f9f3aac..ba14751 100644
--- a/include/engine.h
+++ b/include/engine.h
@@ -13,11 +13,19 @@ struct game {
 	int background;
 };
 
+/*draw the current state of the game*/
 void engine_draw(struct game const *game);
+/*draw the map around the player*/
 void engine_draw_map_around_player(struct game const *game);
+/*draw the player*/
 void engine_draw_player(struct player const *player);
+/*move the player to the direction*/
 int engine_move(struct game *game, int direction);
+/*update the player animation*/
 void engine_tick(struct game *game, int dt);
+/*set the background color*/
 void engine_set_background(struct game *game, int color);
+/*make an interaction with something*/
 void engine_action(struct game const *game, int action);
+/*check the current position of the player. To perform action depends of his location*/
 void engine_check_position(struct game *game);
\ No newline at end of file
diff --git a/include/game.h b/include/game.h
index aaa67b4..53c3bc4 100644
--- a/include/game.h
+++ b/include/game.h
@@ -1,5 +1,6 @@
 #pragma once
 
+/*get the input with a timeout*/
 int get_inputs(void);
 
 enum direction {
diff --git a/include/map.h b/include/map.h
index cfdb9f1..ff7496c 100644
--- a/include/map.h
+++ b/include/map.h
@@ -23,5 +23,7 @@ enum map_state {
 	TILE_CHARACTER = 3,
 };
 
+/*check if a tile is walkable*/
 int map_walkable(struct map const *map, int x, int y);
+/*get the tile under the player*/
 int map_get_player_tile(struct game const *game);
\ No newline at end of file
diff --git a/src/character.c b/src/character.c
index e6b4ef3..0cf0254 100644
--- a/src/character.c
+++ b/src/character.c
@@ -40,6 +40,7 @@ struct character* get_character_xy(struct character *characters[], int x, int y)
 	return &character_default;
 }
 
+/*get the characters for a specified map*/
 struct character** get_map_characters(int id) {
 	if(id == 1) {
 		extern struct character character_Tituya;
diff --git a/src/engine.c b/src/engine.c
index 51c03fe..1941414 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -144,6 +144,7 @@ void engine_action(struct game const *game, int action) {
 	}
 }
 
+/*check the current position of the player. To perform action depends of his location*/
 void engine_check_position(struct game *game) {
 	int player_curr_tile = map_get_player_tile(game);
 	if(player_curr_tile == TILE_DOOR) {
diff --git a/src/map.c b/src/map.c
index f461f11..1b1cde1 100644
--- a/src/map.c
+++ b/src/map.c
@@ -9,6 +9,7 @@ int map_walkable(struct map const *map, int x, int y) {
 	return (tile != TILE_SOLID && tile != TILE_CHARACTER);
 }
 
+/*get the tile under the player*/
 int map_get_player_tile(struct game const *game) {
 	return game->map->info_map[game->player->x + game->map->w * game->player->y];
 }
\ No newline at end of file