diff --git a/src/wp-includes/post-formats.php b/src/wp-includes/post-formats.php
index 7800ba0..2999042 100644
--- a/src/wp-includes/post-formats.php
+++ b/src/wp-includes/post-formats.php
@@ -106,7 +106,7 @@ function get_post_format_strings() {
  *
  * @since 3.1.0
  *
- * @return array The array of post format slugs.
+ * @return array The array of post format slugs, with keys as slugs too.
  */
 function get_post_format_slugs() {
 	$slugs = array_keys( get_post_format_strings() );