diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 79f2ace796..f48028b07c 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -2406,8 +2406,9 @@ add_shortcode( 'video', 'wp_video_shortcode' );
  *
  * @see adjacent_image_link()
  *
- * @param string|array $size Optional. Registered image size or flat array of height and width dimensions.
- *                           0 or 'none' will default to 'post_title' or `$text`. Default 'thumbnail'.
+ * @param string|array $size Optional. Image size. Accepts any valid image size, an array of width and
+ *                           height values in pixels (in that order), 0, or 'none'. 0 or 'none' will
+ *                           default to 'post_title' or `$text`. Default 'thumbnail'.
  * @param string       $text Optional. Link text. Default false.
  */
 function previous_image_link( $size = 'thumbnail', $text = false ) {