diff --git a/overlay_experimental/steam_overlay.cpp b/overlay_experimental/steam_overlay.cpp
index d004296f..ef7230ae 100644
--- a/overlay_experimental/steam_overlay.cpp
+++ b/overlay_experimental/steam_overlay.cpp
@@ -9,6 +9,48 @@
 
 #include "../dll/dll.h"
 
+// Get all steam appid with their name: http://api.steampowered.com/ISteamApps/GetAppList/v2/
+// Steam storefront webapi: https://wiki.teamfortress.com/wiki/User:RJackson/StorefrontAPI
+// http://api.steampowered.com/ISteamUserStats/GetSchemaForGame/v2/?key=27FB0BB1A97A95244C5E08B170A54F96&appid=218620
+/*
+{
+  "game" : {
+    "gameName" : "<name>",
+    "availableGameStats" : {
+      "achievements" : {
+        ("<id>" : {
+          "name" : "achievement_name",
+          "displayName" : "achievement name on screen",
+          "hidden" : (0|1),
+          "description" : "<desc>",
+          "icon" : "<url to icon when achievement is earned>",
+          "icongray" : "<url to icon when achievement is not earned>"
+        },
+        ...)
+      }
+    }
+  }
+}
+*/
+// Get appid infos: http://store.steampowered.com/api/appdetails/?appids=218620
+/*
+"appid" : {
+  "success" : (true|false),
+  (success == true "data" : {
+    ...
+    "name" : "<name>",
+    "steam_appid" : <appid>,
+    (OPT "dlc" : [<dlc id>, <dlc id>]),
+    "header_image" : "<miniature url>" <-- Use this in the overlay ?
+    (OPT "achievements" : {
+      "total" : <num of achievements>
+    }),
+    "background" : "<background url>" <-- Use this as the overlay background ?
+    (OPT "packages" : [<package id>, <package id>])
+  })
+}
+*/
+
 extern LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
 bool Steam_Overlay::IgnoreMsg(UINT uMsg)