diff --git a/CHANGES/v2.5.md b/CHANGES/v2.5.md
index 7e177b84122218b90ea1f20a3247da912cc910a2..e5607740c5978bc1a3f226af3a13431ed15ef61a 100644
--- a/CHANGES/v2.5.md
+++ b/CHANGES/v2.5.md
@@ -176,4 +176,5 @@ For users:
 
 For users:
 - New shortcuts are available for selecting protein atoms: `@chi2-#`, `@chi3-#`,`@chi4-#` and `@chi5-#`
+- Fixed performance of \ref CUSTOM when having zero derivatives with respect to some arguments.