diff --git a/README.md b/README.md
index e3529c3..5ec61d9 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ pnpm run deploy
 
 Then, you need to set the following environment variables in your Cloudflare account:
 
-- `API_TOKEN` - randomly generated token that will be used to authenticate requests
+- `API_TOKEN` - random UUID v4 that will be used to authenticate requests
 - `PROVIDERS` - list of WakaTime instances (in JSON format)
 - `MAIN_PROVIDER` - main WakaTime instance which will be used to retrieve the user's data, etc...
 
diff --git a/vars.example b/vars.example
index d5fcfbe..c2c47c7 100644
--- a/vars.example
+++ b/vars.example
@@ -1,4 +1,4 @@
-# token you'll use in .wakatime.cfg
+# token you'll use in .wakatime.cfg, must be UUID v4 
 API_TOKEN=random token that you want to use
 
 # providers you want to use