diff --git a/README.md b/README.md
index 615d272..5d4c840 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,12 @@ Run octodns-sync in force mode? Set "Yes" to do it.
 
 Default `"No"`.
 
+### `header`
+
+Provide a custom header in pr comment.
+
+Default `"## octoDNS Plan for sha commit"`.
+
 ### `add_pr_comment`
 
 Add plan as a comment, when triggered by a pull request? Set "Yes" to do it.
diff --git a/action.yml b/action.yml
index c9802d1..221824e 100644
--- a/action.yml
+++ b/action.yml
@@ -21,6 +21,10 @@ inputs:
     description: 'Run octodns-sync in force mode?'
     required: false
     default: 'No'
+  header:
+    description: 'Provide a custom header to use in pr comment'
+    required: true
+    default: '## octoDNS Plan for ${{ github.sha }}'
   zones:
     description: 'Space separated list of zones to sync, leave empty to sync
                   all zones in the config file'
@@ -55,6 +59,7 @@ runs:
       id: comment
       env:
         ADD_PR_COMMENT: ${{ inputs.add_pr_comment }}
+        HEADER: ${{ inputs.header }}
         PR_COMMENT_TOKEN: ${{ inputs.pr_comment_token }}
         COMMENTS_URL: ${{ github.event.pull_request.comments_url }}
       run: ${{ github.action_path }}/scripts/comment.sh
diff --git a/scripts/comment.sh b/scripts/comment.sh
index be7b8f9..e1ef67e 100755
--- a/scripts/comment.sh
+++ b/scripts/comment.sh
@@ -27,8 +27,7 @@ if [ -z "${COMMENTS_URL}" ]; then
 fi
 
 # Construct the comment body
-_sha="$(git log -1 --format='%h')"
-_header="## octoDNS Plan for ${_sha}"
+_header="${HEADER}"
 _footer="Automatically generated by octodns-sync"
 _body="${_header}