diff --git a/lib/SimpleSAML/Session.php b/lib/SimpleSAML/Session.php
index 5c7a13bcf2fee477b58638da3a0303ea68a96a50..c88868f7ce8adb6f7c10c4e42ac1e9d00cec75ee 100644
--- a/lib/SimpleSAML/Session.php
+++ b/lib/SimpleSAML/Session.php
@@ -934,9 +934,6 @@ class Session implements \Serializable, Utils\ClearableState
     /**
      * This function removes expired data from the data store.
      *
-     * Note that this function doesn't mark the session object as dirty. This means that
-     * if the only change to the session object is that some data has expired, it will not be
-     * written back to the session store.
      * @return void
      */
     private function expireData()