diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 42815f289500ee9892044ca6276ccd8c9fb8496b..f05284ed7ea4eb56c1bd4320cc1a4898b6c32fe6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,8 @@ Added
 * Simple built-in :mod:`.deprecated` decorator.
 * New :mod:`fsl.data.utils` module, which currently contains one function
   :func:`.guessType`, which guess the data type of a file/directory path.
+* New `.commonBase` function for finding the common prefix of a set of
+  file/directory paths.
 
 
 Changed