diff --git a/src/wp-admin/includes/network.php b/src/wp-admin/includes/network.php
index 845d2c0d50..ea6ec24bac 100644
--- a/src/wp-admin/includes/network.php
+++ b/src/wp-admin/includes/network.php
@@ -14,7 +14,7 @@
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @return Whether a network exists.
+ * @return string|false Base domain if network exists, otherwise false.
  */
 function network_domain_check() {
 	global $wpdb;