diff --git a/kas/__version__.py b/kas/__version__.py
index 988e9cc..86bac53 100644
--- a/kas/__version__.py
+++ b/kas/__version__.py
@@ -26,5 +26,7 @@ __license__ = 'MIT'
 __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 __version__ = '0.13.0'
+
+# Please update docs/format-changelog.rst when changing the file version.
 __file_version__ = 4
 __compatible_file_version__ = 1