diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 94eafd0..6920b97 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,7 +7,8 @@ on:
   schedule:
     # daily, 01:00 UTC
     - cron: "0 1 * * *"
-  workflow_call:
+  workflow_dispatch:
+    # https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/
 
 jobs:
   synchronize: