diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 7e0ee55f33..dc9760574e 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -3032,6 +3032,8 @@ function wp_rel_nofollow_callback( $matches ) {
 /**
  * Adds rel noreferrer and noopener to all HTML A elements that have a target.
  *
+ * @since 5.1.0
+ *
  * @param string $text Content that may contain HTML A elements.
  * @return string Converted content.
  */
@@ -3050,6 +3052,8 @@ function wp_targeted_link_rel( $text ) {
  * Will not duplicate existing noreferrer and noopener values
  * to prevent from invalidating the HTML.
  *
+ * @since 5.1.0
+ *
  * @param array $matches Single Match
  * @return string HTML A Element with rel noreferrer noopener in addition to any existing values
  */