diff --git a/action.yml b/action.yml
index 31ba2f9..14c2d88 100644
--- a/action.yml
+++ b/action.yml
@@ -14,6 +14,7 @@ inputs:
     required: true
   content-filepath:
     description: 'The file path to the issue content'
+    required: true
   labels:
     description: 'A comma or newline-separated list of labels'
   assignees: