diff --git a/maintenance/retention.rst b/maintenance/retention.rst
index 1cff42e..c795f65 100644
--- a/maintenance/retention.rst
+++ b/maintenance/retention.rst
@@ -11,6 +11,10 @@ reasonable level. Additionally, raw data on disk and sandbox files can
 also be deleted with the Data Retention Policy, which can help you to
 manage your disk space usage.
 
+
+.. hint::
+   Date retention takes the import timestamp '@timestamp' into account to decide weather a event should be deleted.
+
 The Data Retention Policy is configured in ``Settings`` > ``Advanced`` >
 ``Data Retention``.
 
@@ -73,4 +77,4 @@ There are multiple options within the Data Retention Policy:
   .. figure:: ../images/cockpit_data-retention-other.png
       :alt: Data Retention - Others
 
-      Data Retention - Others
\ No newline at end of file
+      Data Retention - Others