README.md in gitlab-triage-1.14.3 vs README.md in gitlab-triage-1.15.0

@@ -583,10 +583,11 @@
 - [`mention` action](#mention-action)
 - [`move` action](#move-action)
 - [`comment` action](#comment-action)
 - [`comment_type` action option](#comment-type-action-option)
 - [`summarize` action](#summarize-action)
+- [`comment_on_summary` action](#comment-on-summary-action)
 
 ##### Labels action
 
 Adds a number of labels to the resource.
 
@@ -864,9 +865,59 @@
 
   Please take care of them before the end of 2000-01-01
 
   /label ~"needs attention"
   ```
+
+##### Comment on summary action
+
+Generates one comment for each resource, attaching these comments to the summary
+created by the [`summarize` action](#summarize-action).
+
+The use case for this is wanting to create a summary with an overview, and then
+a threaded discussion for each resource, with a header comment starting each
+discussion.
+
+Accepts a single string value: the template used to generate the comments. For
+details of the syntax of this template, see the [comment action](#comment-action).
+
+Since this action depends on the summary, it is invalid to supply a
+`comment_on_summary` action without an accompanying `summarize` sibling action.
+The `summarize` action will always be completed first.
+
+Just like for [comment action](#comment-action), setting `comment_type` in the
+`actions` set controls whether the comment must be resolved for merge requests.
+See: [`comment_type` action option](#comment-type-action-option).
+
+Example:
+
+```yml
+resource_rules:
+  issues:
+    rules:
+      - name: List of issues to discuss
+        limits:
+          most_recent: 15
+        actions:
+          comment_type: thread
+          comment_on_summary: |
+            # {{title}}
+            
+            author: {{author}}
+          summarize:
+            title: |
+              #{resource[:type].capitalize} require labels
+            item: |
+              - [ ] [{{title}}]({{web_url}}) {{labels}}
+            summary: |
+              The following {{type}} require labels:
+
+              {{items}}
+
+              Please take care of them before the end of #{7.days.from_now.strftime('%Y-%m-%d')}
+
+              /label ~"needs attention"
+```
 
 ### Summary policies
 
 Summary policies are special policies that join multiple rule policies together
 to create a summary issue with all the sub-policies' summaries.