diff --git a/lib/Doctrine/DBAL/Schema/Comparator.php b/lib/Doctrine/DBAL/Schema/Comparator.php
index 2406ab01d0a..dca4a3c45c5 100644
--- a/lib/Doctrine/DBAL/Schema/Comparator.php
+++ b/lib/Doctrine/DBAL/Schema/Comparator.php
@@ -170,7 +170,7 @@ public function diffSequence(Sequence $sequence1, Sequence $sequence2) : bool
     /**
      * Returns the difference between the tables $table1 and $table2.
      *
-     * If there are no differences this method returns the boolean false.
+     * If there are no differences this method returns null.
      */
     public function diffTable(Table $table1, Table $table2) : ?TableDiff
     {