diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
index 9d5707093ae..b455174e67f 100644
--- a/.github/workflows/unit.yml
+++ b/.github/workflows/unit.yml
@@ -4,17 +4,16 @@ env:
 on:
   push:
     branches:
-      - master  # Triggers the workflow on commits pushed to master, including merges.
+      - master
   pull_request:
-    types: [opened, synchronize, reopened]  # Triggers the workflow on new, updated, or reopened PRs.
-  workflow_dispatch:  # Allows the workflow to be manually triggered.
+  workflow_dispatch:
+  merge_group:
   issue_comment:
-    types: [created]  # Triggers the workflow when a comment is created.
+    types: [created]  # Triggers the workflow when a comment is created. see `if` section
 jobs:
   unit:
     if: >-
-      github.event_name == 'pull_request' || 
-      (github.event_name == 'issue_comment' && startsWith(github.event.comment.body, '/retest unit'))
+      github.event_name != 'issue_comment' || startsWith(github.event.comment.body, '/retest unit')
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3