diff --git a/wp-admin/includes/plugin.php b/wp-admin/includes/plugin.php
index a20c93dfa6..84bb3d82a4 100644
--- a/wp-admin/includes/plugin.php
+++ b/wp-admin/includes/plugin.php
@@ -816,7 +816,7 @@ function activate_plugins( $plugins, $redirect = '', $network_wide = false, $sil
  *
  * @param array  $plugins    List of plugins to delete.
  * @param string $deprecated Deprecated.
- * @return bool|null|WP_Error True on success, false is $plugins is empty, WP_Error on failure.
+ * @return bool|null|WP_Error True on success, false if `$plugins` is empty, WP_Error on failure.
  *                            Null if filesystem credentials are required to proceed.
  */
 function delete_plugins( $plugins, $deprecated = '' ) {
diff --git a/wp-admin/includes/theme.php b/wp-admin/includes/theme.php
index 69ae209648..a9b4cdd02b 100644
--- a/wp-admin/includes/theme.php
+++ b/wp-admin/includes/theme.php
@@ -13,9 +13,10 @@
  *
  * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
  *
- * @param string $stylesheet Stylesheet of the theme to delete
- * @param string $redirect Redirect to page when complete.
- * @return void|bool|WP_Error When void, echoes content.
+ * @param string $stylesheet Stylesheet of the theme to delete.
+ * @param string $redirect   Redirect to page when complete.
+ * @return bool|null|WP_Error True on success, false if `$stylesheet` is empty, WP_Error on failure.
+ *                            Null if filesystem credentials are required to proceed.
  */
 function delete_theme( $stylesheet, $redirect = '' ) {
 	global $wp_filesystem;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6d1ec887ba..fc0079dc49 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42777';
+$wp_version = '5.0-alpha-42778';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.