diff --git a/.docs/changelog.md b/.docs/changelog.md
index e3f7a573e4c1ff84c500f1215b548710a6040c83..1f4a4ed9040a1b623f9179035c1f11b576b88034 100644
--- a/.docs/changelog.md
+++ b/.docs/changelog.md
@@ -6,6 +6,8 @@ author: Martin Weise
 
 #### Changes
 
+* Improved default mask for PIDs
+  in [#521](https://gitlab.phaidra.org/fair-data-austria-db-repository/fda-services/-/issues/521).
 * Added a visual filter for displaying starred/unstarred/all subsets in the UI.
 * Specified image platform as `linux/amd64` in `docker-compose.yaml` deployment to enable host platform (e.g. ARM) to
   emulate it.