diff --git a/wp-includes/post.php b/wp-includes/post.php
index 7e46f698ff..00a05babc5 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -3368,7 +3368,7 @@ function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {
  *     @type int    $menu_order            The order the post should be displayed in. Default 0.
  *     @type string $post_mime_type        The mime type of the post. Default empty.
  *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
- *     @type array  $post_category         Array of category names, slugs, or IDs.
+ *     @type array  $post_category         Array of category IDs.
  *                                         Defaults to value of the 'default_category' option.
  *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
  *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
@@ -4381,10 +4381,10 @@ function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $a
  *
  * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
  *                                   of the global $post. Default 0.
- * @param array|int $post_categories Optional. List of categories or ID of category.
+ * @param array|int $post_categories Optional. List of category IDs, or the ID of a single category.
  *                                   Default empty array.
- * @param bool      $append         If true, don't delete existing categories, just add on.
- *                                  If false, replace the categories with the new categories.
+ * @param bool      $append          If true, don't delete existing categories, just add on.
+ *                                   If false, replace the categories with the new categories.
  * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
  */
 function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d71455d61e..5ff83728b4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44659';
+$wp_version = '5.1-beta1-44660';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.