diff --git a/heimdall/README.md b/heimdall/README.md
index 171c797..671d90f 100644
--- a/heimdall/README.md
+++ b/heimdall/README.md
@@ -16,7 +16,7 @@ chmod +x heimdall-install.sh
 PHP_VERSION
   - php version to use (currently defaults to 83)
 
-APP_VERSION
+HEIMDALL_VERSION
   - Heimdall version to use (currently defaults to 2.6.1)
 
 ## Mount points (should be mounted outside the jail)