diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 3caf7dd3cb..7f2182a7dd 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+#### 1.4.2.3 - 
+* Fix bug in loop optimization, apply https://github.com/Microsoft/visualfsharp/pull/756/ 
+
 #### 1.4.2.2 - 
 * #488 - Performance problems with project references