diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b89cf1821eb4c5662f69e7efa7da129c2ee52e48..7ad95dfd62b53fefad754397a4947579d89aeb4d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,5 +1,7 @@
 Unreleased changes
 ------------------
+* ``km3io.tools.unique`` and ``km3io.tools.uniquecount`` were added to help
+  working with unique elements (e.g. DOM IDs or channel IDs)
 * Internal restructuring of ``.tools``, ROOT related stuff is moved
   to ``.rootio``