diff --git a/README.md b/README.md
index daa2f5be368f9548bb0f0fc4b68a204df4cec75b..63d5cc58c04146d92088e9dfe8c6a4633bf926fc 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,9 @@ ThX to [adadietrich](https://forum.checkmk.com/u/adadietrich/summary) for the id
 ### Download
 * [Download latest mkp file][PACKAGE]
 
-**Note**: before you update to a newer version, always check the [CHANGELOG](CHANGELOG). There migth be incompatible changes.
-                        
+**Note**: before you update to a newer version, always check the [CHANGELOG](CHANGELOG). There migth be incompatible changes.\
+**Note**: this plugin needs at least Checkmk 2.3.0b1 to work.   
+
 ---
 ### Installation