diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 308b60b6..62418c9b 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -299,6 +299,7 @@ if (isset($_GET["pgsql"])) {
 		}
 
 		function supportsIndex($table_status) {
+			// returns true for "materialized view"
 			return $table_status["Engine"] != "view";
 		}