diff --git a/README.md b/README.md
index 4688748f..977bfb91 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,7 @@ to also theme standard elements, such as, button and textblock etc.
 
 - [#314 Fix NavigatorWindow not working if there is only one document](https://github.com/Dirkster99/AvalonDock/pull/314)   (thanx to [Siegfried Pammer](https://github.com/siegfriedpammer))
 - [#308 Code Clean-Up Serialization](https://github.com/Dirkster99/AvalonDock/pull/308)   (thanx to [RadvileSaveraiteFemtika](https://github.com/RadvileSaveraiteFemtika))
+- [#317 Aded LayoutItem null check when processing mouseMiddleClickButton](https://github.com/Dirkster99/AvalonDock/pull/317)    (thanx to [JuanCar Orozco](https://github.com/Skaptor))
 
 ## Features and Fixes Added in Version 4.60.0