diff --git a/adminer/edit.inc.php b/adminer/edit.inc.php
index c3fdb33e..c8039c37 100644
--- a/adminer/edit.inc.php
+++ b/adminer/edit.inc.php
@@ -92,7 +92,7 @@ if ($_POST["save"]) {
 	}
 }
 
-if (!support("table") && !$fields) {
+if (!support("table") && !$fields) { // used by Mongo and SimpleDB
 	if (!$where) { // insert
 		$result = $driver->select($TABLE, array("*"), $where, array("*"));
 		$row = ($result ? $result->fetch_assoc() : false);
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index 7292c4af..073bda50 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -738,7 +738,7 @@ function column_foreign_keys($table) {
 /** Compute fields() from $_POST edit data
 * @return Field[] same as fields()
 */
-function fields_from_edit() {
+function fields_from_edit() { // used by Mongo and SimpleDB
 	global $driver;
 	$return = array();
 	foreach ((array) $_POST["field_keys"] as $key => $val) {