Index: src/wp-admin/network/edit.php
===================================================================
--- src/wp-admin/network/edit.php	(revision 25946)
+++ src/wp-admin/network/edit.php	(working copy)
@@ -18,9 +18,21 @@
 	exit;
 }

-do_action( 'wpmuadminedit' , '' );
+/**
+ * Fires when the user makes a change in the Multisite Network Admin.
+ *
+ * @since 3.0.0
+ */
+do_action( 'wpmuadminedit' );

-// Let plugins use us as a post handler easily
+/**
+ * Fires the requested handler action
+ *
+ * The dynamic portion of the hook name, $_GET['action'],
+ * refers to the name of the action being fired
+ *
+ * @since 3.1.0
+ */
 do_action( 'network_admin_edit_' . $_GET['action'] );

 wp_redirect( network_admin_url() );
Index: src/wp-admin/network/users.php
===================================================================
--- src/wp-admin/network/users.php	(revision 25946)
+++ src/wp-admin/network/users.php	(working copy)
@@ -87,7 +87,8 @@
 }

 if ( isset( $_GET['action'] ) ) {
-	do_action( 'wpmuadminedit' , '' );
+	/** This action is documented in wp-admin/network/edit.php */
+	do_action( 'wpmuadminedit' );

 	switch ( $_GET['action'] ) {
 		case 'deleteuser':