diff --git a/docs/source/release/v5.1.0/mantidworkbench.rst b/docs/source/release/v5.1.0/mantidworkbench.rst
index 040b994c8ec9e752a18ee7c0176f5008b34ed7c7..ab08d04905b1de6065bfdd90b59de522938e6735 100644
--- a/docs/source/release/v5.1.0/mantidworkbench.rst
+++ b/docs/source/release/v5.1.0/mantidworkbench.rst
@@ -9,6 +9,7 @@ Improvements
 ############
 
 - Tile plots are now reloaded correctly by project recovery.
+- Fixed an issue where some scripts were running slower if a  plot was open at the same time.
 
 
 Bugfixes