Update README

Author: peter-evans

README.md

@@ -191,8 +191,11 @@ You can inspect the payload with the following step.
         run: echo "$PAYLOAD_CONTEXT"
 ```
 
-### Reacting to the comment on completion
+### Responding to the comment on command completion
 
+Using [create-or-update-comment](https://github.com/peter-evans/create-or-update-comment) action there are a number of ways you can respond to the comment once the command has completed.
+
+The simplest response is to add a :hooray: reaction to the comment.
 ```yml
       - name: Add reaction
         uses: peter-evans/create-or-update-comment@v1