diff --git a/compose/reference/ps.md b/compose/reference/ps.md
index bf92f5d706..20aa45f248 100644
--- a/compose/reference/ps.md
+++ b/compose/reference/ps.md
@@ -11,7 +11,7 @@ title: ps
 
 # ps
 
-```
+```none
 Usage: ps [options] [SERVICE...]
 
 Options: