diff --git a/source/_integrations/gntp.markdown b/source/_integrations/gntp.markdown
index db9e0740f43..dea35d7b366 100644
--- a/source/_integrations/gntp.markdown
+++ b/source/_integrations/gntp.markdown
@@ -10,6 +10,14 @@ ha_platforms:
   - notify
 ---
 
+<div class='note warning'>
+
+The Growl (GnGNTP) integration has been deprecated and is going to be removed
+in Home Assistant Core 2021.6. The Growl project
+[has retired](https://growl.github.io/growl/).
+
+</div>
+
 [GNTP](http://growl.info/documentation/developer/gntp.php) is a specification for sending and receiving notifications between computers. The most well known server implementations are [Growl](http://growl.info) for Mac and [Growl for Windows](http://www.growlforwindows.com/).
 
 To use GNTP notifications, add the following to your `configuration.yaml` file: