diff --git a/README.md b/README.md
index 7c8f638f..10d0beb3 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+# :warning: Slack Notify Build was [DEPRECATED] May 2024 :warning:
+
 # Slack Notify Build
 
 This action prints your GitHub Action build status to Slack. It takes an opinionated approach by showing attachments for metadata like branch, pull request, and event. This action allows [existing messages to be updated](#updating-an-existing-message) to reduce unwanted noise in your Slack channel. Heavily-inspired by [Post Slack messages](https://github.com/marketplace/actions/post-slack-message).