diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 800755fa..729a462a 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -5,6 +5,7 @@ Release Notes v1.6 (Under Development)
 Changes
 -------
 
+- Fixed Posix locking functions for Windows (bel2125)
 - Updated version number
 
 Release Notes v1.5