diff --git a/MathRenderer.php b/MathRenderer.php
index 635846f..3d31ac9 100644
--- a/MathRenderer.php
+++ b/MathRenderer.php
@@ -325,7 +325,7 @@ abstract class MathRenderer {
 	 * to the database even if they are empty.
 	 *
 	 * This function can be seen as protected function.
-	 * @param DatabaseBase $dbw
+	 * @param \Wikimedia\Rdbms\IDatabase $dbw
 	 */
 	public function writeToDatabase( $dbw = null ) {
 		# Now save it back to the DB: