diff --git a/docs/plugins.md b/docs/plugins.md
index c67a780cc..c588af695 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -39,7 +39,7 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 case "$1" in
   hello)
     [[ -z $2 ]] && echo "Please specify an app to run the command on" && exit 1
-    [[ ! -d "$DOKKU_ROOT/$APP" ]] && echo "App $APP does not exist" && exit 1
+    [[ ! -d "$DOKKU_ROOT/$2" ]] && echo "App $2 does not exist" && exit 1
     APP="$2";
 
     echo "Hello $APP"