changelog thing

Author: Howon Lee

Diff for: docs/changelog.md

@@ -5,6 +5,16 @@ description: The latest updates and changes to CodeRabbit.
 sidebar_position: 13
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+## April 11 2025
+
+### Agent Chat
+
+```mdx-code-block
+<ProPlanNotice />
+```
+
+We're thrilled to introduce agentic planning on GitHub for CodeRabbit chat as Generally Available for Pro users. This enhancement lets you make more advanced requests that span multiple files. Just add a review or issue comment on any pull request, or issue comment on an issue, issue tagging `@coderabbitai` along with your natural language request for a code change, and the chat will develop a plan for complex modifications. Upon reviewing the plan and getting your consent, CodeRabbit will emit a stacked PR, commit or copyable snippet to your PR or issue for those code changes.
+
 ## April 8, 2025
 
 ### New Static Analysis Tools