diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 5887a740ffc2117efac404727219ae7af4b5f30f..7dfea26b675911a5508448a5ec7240cbb89c015f 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -3,6 +3,8 @@
 ## Summary
 ### Features
 - cta/CTA#89 - Create stubs for Enstore tape label format
+### Bug fixes
+- cta/CTA#127 - DataTransferSession keeps busy while waiting for a mount to be required
 ### Continuous Integration
 - cta/CTA#7  - Use same versionlock.list file for xrootd4 and 5
 - cta/CTA#18 - CI - Testing of DB schema upgrade script