diff --git a/src/file.h b/src/file.h
index 852dea6..3c1be0c 100644
--- a/src/file.h
+++ b/src/file.h
@@ -4,13 +4,44 @@
 #ifndef __FILE_H__
 #define __FILE_H__
 
+
+//valid copy flags
+#define cp_DEFAULT 0
 #define CP_LINK 1
 #define CP_RECURSIVE 2
 #define CP_NO_TARGET_DIR 4
 
-int copy(const char * path, const char * dest, u_int32_t flags);
+/**
+ * @brief execute the cp command from the source to the dest
+ * @param source path to the source files
+ * @param dest path to the destination folder
+ * @param flags refer to the "valid copy flags" use them like this CP_LINK | CP_RECURSIVE
+ * @return status code
+ */
+int copy(const char * source, const char * dest, u_int32_t flags);
+
+/**
+ * @brief execute the cp command from the source to the dest
+ * @param source path to the source files
+ * @param dest path to the destination folder
+*  @param bool enable recursive rm -r
+ * @return status code
+ */
 int delete(const char * path, bool recursive);
+
+/**
+ * @brief Run the mv command
+ * @param source
+ * @param destination
+ * @return mv's exit value
+ */
 int move(const char * source, const char * destination);
+
+/**
+ * @brief Recursively rename all file and folder to lowercase.
+ *
+ * @param folder
+ */
 void casefold(const char * folder);
 
 #endif
diff --git a/src/fomod.h b/src/fomod.h
index 8f12725..8726d5e 100644
--- a/src/fomod.h
+++ b/src/fomod.h
@@ -5,6 +5,7 @@
 #include "fomod/group.h"
 #include "fomod/xmlUtil.h"
 
+
 int installFOMod(const char * modFolder, const char * destination);
 
 #endif
diff --git a/src/getHome.h b/src/getHome.h
index d242b54..141b34c 100644
--- a/src/getHome.h
+++ b/src/getHome.h
@@ -1 +1,8 @@
+
+
+/**
+ * @brief Get the user home dir regardless if he used sudo.
+ *
+ * @return char* path to the home dir
+ */
 char * getHome();
diff --git a/src/install.h b/src/install.h
index 9fb8a57..5a89ca6 100644
--- a/src/install.h
+++ b/src/install.h
@@ -1,6 +1,15 @@
 #ifndef __INSTALL_H__
 #define __INSTALL_H__
+#include <stdlib.h>
 #define INSTALLED_FLAG_FILE "__DO_NOT_REMOVE__"
+
+/**
+ * @brief Add a mod to the folder defined in main.h
+ *
+ * @param filePath path to the mod file
+ * @param appId game for which the mod is destined to be used with.
+ * @return EXIT_SUCCESS or EXIT_FAILURE
+ */
 int addMod(char * filePath, int appId);
 
 #endif
diff --git a/src/macro.h b/src/macro.h
index 82803a9..10b43f7 100644
--- a/src/macro.h
+++ b/src/macro.h
@@ -1,7 +1,7 @@
 #ifndef __MACRO_H__
 #define __MACRO_H__
 
-//cannot be empty it's made for fixed size array
+//cannot be empty it's made for fixed size array like the ones in steam.h
 #define LEN(array) sizeof(array) / sizeof(array[0])
 
 #endif
diff --git a/src/main.h b/src/main.h
index 02a5edd..e63cd96 100644
--- a/src/main.h
+++ b/src/main.h
@@ -5,6 +5,9 @@
 // in c "A" "B" is the same as "AB"
 #define MANAGER_FILES ".local/share/" APP_NAME
 #define MOD_FOLDER_NAME "MOD_FOLDER"
+//the folder in which the games file will be linked or copied
 #define GAME_FOLDER_NAME "GAME_FOLDER"
+//the director that will contain all modifications to game files while being deployed
 #define GAME_UPPER_DIR_NAME "UPPER_DIRS"
+//overlayfs temporary dir.
 #define GAME_WORK_DIR_NAME "WORK_DIRS"
diff --git a/src/order.c b/src/order.c
index d4ef1de..0354585 100644
--- a/src/order.c
+++ b/src/order.c
@@ -96,6 +96,5 @@ void swapPlace(int appid, int modId, int modId2) {
 	GList * list = listMods(appid);
 
 
-
 	g_list_free(list);
 }
diff --git a/src/order.h b/src/order.h
index 118381d..020b04d 100644
--- a/src/order.h
+++ b/src/order.h
@@ -15,6 +15,15 @@
  * @return GList of char containing the name of the mod folder in order
  */
 GList * listMods(int appid);
+
+/**
+ * @brief Change the mod order by swaping two mod
+ *
+ * @param appid the game
+ * index of the mod in the mod list.
+ * @param modId
+ * @param modId2
+ */
 void swapPlace(int appid, int modId, int modId2);
 
 #endif
diff --git a/src/overlayfs.h b/src/overlayfs.h
index 438335e..f9eb612 100644
--- a/src/overlayfs.h
+++ b/src/overlayfs.h
@@ -1,6 +1,15 @@
 #ifndef __OVERLAY_H__
 #define __OVERLAY_H__
 
+/**
+ * @brief Overlayfs is what make it possible to deploy to the game files without altering anything.
+ * it allows us to overlay multiple folder over the game files. like appling filters to an image.
+ * @param sources a null ended table of folder that will overlay of the game files
+ * @param dest the overlayed folder(the game data folder)
+ * @param upperdir the director that will store the changed files
+ * @param workdir a directory that will contains only temporary files.
+ * @return int error code
+ */
 int overlayMount(char ** sources, const char * dest, const char * upperdir, const char * workdir);
 
 #endif
diff --git a/src/steam.c b/src/steam.c
index b26da3e..ee77166 100644
--- a/src/steam.c
+++ b/src/steam.c
@@ -223,9 +223,9 @@ GHashTable* search_games(int * status) {
 }
 
 
-int getGameIdFromAppId(u_int32_t id) {
+int getGameIdFromAppId(u_int32_t appid) {
 	for(int k = 0; k < LEN(GAMES_APPIDS); k++) {
-		if(id == GAMES_APPIDS[k]) {
+		if(appid == GAMES_APPIDS[k]) {
 			return k;
 		}
 	}
diff --git a/src/steam.h b/src/steam.h
index dedc2e7..983ce4a 100644
--- a/src/steam.h
+++ b/src/steam.h
@@ -36,14 +36,32 @@ const static char * steamLibraries[] = {
 // order has to be the same as in GAMES_NAMES
 const static u_int32_t GAMES_APPIDS[] = {
 	489830,
+	22330,
+	377160
 };
 
 //the name of the game in the steamapps/common folder
 const static char * GAMES_NAMES[] = {
 	"Skyrim Special Edition",
+	"Oblivion",
+	"Fallout 4"
 };
 
+/**
+ * @brief list all installed games and the paths to the game's files
+ *
+ * @param status pointer to a status variable that will be modified to EXIT_SUCCESS or EXIT_FAILURE
+ * @return GHashTable* a map appid(int) => path(char *)
+ */
+ //TODO: flip the return value and parameter
 GHashTable* search_games(int * status);
-int getGameIdFromAppId(u_int32_t id);
+
+/**
+ * @brief search the index of the game inside GAMES_NAMES or GAMES_APPIDS
+ *
+ * @param appid
+ * @return -1 in case of failure or the index of the game.
+ */
+int getGameIdFromAppId(u_int32_t appid);
 
 #endif