diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 0c27267991..94ce3cd53f 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -2439,8 +2439,8 @@ function next_image_link( $size = 'thumbnail', $text = false ) {
  * @since 2.5.0
  *
  * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
- * @param string|array $size Optional. Registered image size or flat array of height and width dimensions.
- *                                     Default 'thumbnail'.
+ * @param string|array $size Optional. Image size. Accepts any valid image size, or an array of width and height
+ *                           values in pixels (in that order). Default 'thumbnail'.
  * @param bool         $text Optional. Link text. Default false.
  */
 function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {