diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
index 48b8de9851..e7158b9021 100644
--- a/src/wp-includes/general-template.php
+++ b/src/wp-includes/general-template.php
@@ -726,10 +726,12 @@ function get_bloginfo( $show = '', $filter = 'raw' ) {
 /**
  * Returns the Site Icon URL.
  *
- * @param  int    $size    Size of the site icon.
- * @param  string $url     Fallback url if no site icon is found.
- * @param  int    $blog_id Id of the blog to get the site icon for.
- * @return string          Site Icon URL.
+ * @since 4.3.0
+ *
+ * @param int    $size    Optional. Size of the site icon. Default 512 (pixels).
+ * @param string $url     Optional. Fallback url if no site icon is found. Default empty.
+ * @param int    $blog_id Optional. ID of the blog to get the site icon for. Default current blog.
+ * @return string Site Icon URL.
  */
 function get_site_icon_url( $size = 512, $url = '', $blog_id = 0 ) {
 	if ( $blog_id && is_multisite() ) {