diff --git a/wp-includes/l10n.php b/wp-includes/l10n.php
index 05aa52afcc..23642f02f9 100644
--- a/wp-includes/l10n.php
+++ b/wp-includes/l10n.php
@@ -554,6 +554,8 @@ function load_default_textdomain() {
  * @param string $domain          Unique identifier for retrieving translated strings
  * @param string $deprecated      Use the $plugin_rel_path parameter instead.
  * @param string $plugin_rel_path Optional. Relative path to WP_PLUGIN_DIR where the .mo file resides.
+ *                                Default false.
+ * @return bool True when textdomain is successfully loaded, false otherwise.
  */
 function load_plugin_textdomain( $domain, $deprecated = false, $plugin_rel_path = false ) {
 	$locale = get_locale();
@@ -662,6 +664,8 @@ function load_theme_textdomain( $domain, $path = false ) {
  * @since 2.9.0
  *
  * @param string $domain Text domain. Unique identifier for retrieving translated strings.
+ * @param string $path   Optional. Path to the directory containing the .mo file.
+ *                       Default false.
  * @return bool True when the theme textdomain is successfully loaded, false otherwise.
  */
 function load_child_theme_textdomain( $domain, $path = false ) {