diff --git a/.gitignore b/.gitignore
index aff9647..010a591 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .mypy_cache
 __pycache__
-.tox
\ No newline at end of file
+.tox
+.vscode
\ No newline at end of file
diff --git a/README.md b/README.md
index 87ceaa0..92bb5a2 100644
--- a/README.md
+++ b/README.md
@@ -52,8 +52,9 @@ git clone https://github.com/ModOrganizer2/modorganizer-basic_games basic_games
 | [Dungeon Siege II](https://store.steampowered.com/app/39200/Dungeon_Siege_II/) | Holt59 | [game_dungeonsiege2.py](games/game_dungeonsiege2.py) | <ul><li>steam detection</li><li>mod data checker</li></ul> |
 | [Mount & Blade II: Bannerlord](https://store.steampowered.com/app/261550/Mount__Blade_II_Bannerlord/) | Holt59 | | <ul><li>steam detection</li><li>mod data checker</li></ul> |
 | [S.T.A.L.K.E.R. Anomaly](https://www.stalker-anomaly.com/) | [Qudix](https://github.com/Qudix) | [game_stalkeranomaly.py](games/game_stalkeranomaly.py) | |
-| [Stardew Valley](https://store.steampowered.com/app/413150/Stardew_Valley/) | [Syer10](https://github.com/Syer10), Holt59 | [game_stardewvalley.py](games/game_stardewvalley.py) | <ul><li>steam detection</li><li>mod data checker</li></ul> |
+| [Stardew Valley](https://store.steampowered.com/app/413150/Stardew_Valley/) | [Syer10](https://github.com/Syer10), Holt59 | [game_stardewvalley.py](games/game_stardewvalley.py) | <ul><li>steam and GOG detection</li><li>mod data checker</li></ul> |
 | [The Witcher 3: Wild Hunt](https://store.steampowered.com/app/292030/The_Witcher_3_Wild_Hunt/) | Holt59 | [game_witcher3.py](games/game_witcher3.py) | <ul><li>steam detection</li><li>save game preview</li></ul> |
+| [Zeus and Poseidon](https://store.steampowered.com/app/566050/Zeus__Poseidon/) | Holt59 | [game_zeusandpoiseidon.py](games/game_zeusandpoiseidon.py) | <ul><li>steam and GOG detection</li><li>mod data checker</li></ul> |
 
 ## How to add a new game?
 
@@ -164,7 +165,8 @@ If the column `Ini` is empty, it means it only accepts a basic string.
 | GameDocumentsDirectory | Documents directory (Optional) | `documentsDirectory` | `str` or `QDir` | |
 | GameSavesDirectory | Directory containing saves (Optional, default to `GameDocumentsDirectory`) | `savesDirectory` | `str` or `QDir` | |
 | GameSaveExtension | Save file extension (Optional) `savegameExtension` | `str` | |
-| GameSteamId | Steam ID of the game (Optional) | `steamAPPId` | `str` | |
+| GameSteamId | Steam ID of the game (Optional) | `steamAPPId` | `List[str]` or `str` or `int` | |
+| GameGogId | GOG ID of the game (Optional) | `gogAPPId` | `List[str]` or `str` or `int` | |
 
 You can use the following variables for `str`:
 
@@ -176,9 +178,15 @@ You can use the following variables for `str`:
 
 The meta-plugin provides some useful extra feature:
 
-1. **Automatic Steam game detection:** If you provide a Steam ID for the game (via `GameSteamId` or by
-  overriding `steamAPPId()`), the game will be listed in the list of available games when creating a new
-  MO2 instance (if the game is installed via Steam).
+1. **Automatic Steam and GOG game detection:** If you provide Steam or GOG IDs for the game (via
+  `GameSteamId` or `GameGogId`), the game will be listed in the list of available games when creating a new
+  MO2 instance (if the game is installed via Steam or GOG).
 2. **Basic save game preview:** If you use the Python version, and if you can easily obtain a picture (file)
   for any saves, you can provide basic save-game preview by using the `BasicGameSaveGameInfo`.
   See [games/game_witcher3.py](games/game_witcher3.py) for  more details.
+
+Game IDs can be found here:
+
+- For Steam on [Steam Database](https://steamdb.info/)
+- For GOG on [GOG Database](https://www.gogdb.org/)
+