diff --git a/wp-includes/post.php b/wp-includes/post.php
index ac29d9628f..54e6c14f3b 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -1742,7 +1742,7 @@ function _add_post_type_submenus() {
 }
 
 /**
- * Register support of certain features for a post type.
+ * Registers support of certain features for a post type.
  *
  * All core features are directly associated with a functional area of the edit
  * screen, such as the editor or a meta box. Features include: 'title', 'editor',
@@ -1753,6 +1753,16 @@ function _add_post_type_submenus() {
  * store revisions, and the 'comments' feature dictates whether the comments
  * count will show on the edit screen.
  *
+ * Example usage:
+ *
+ *     add_post_type_support( 'my_post_type', 'comments' );
+ *     add_post_type_support( 'my_post_type', array(
+ *         'author', 'excerpt',
+ *     ) );
+ *     add_post_type_support( 'my_post_type', 'my_feature', array(
+ *         'field' => 'value',
+ *     ) );
+ *
  * @since 3.0.0
  *
  * @global array $_wp_post_type_features
@@ -1760,6 +1770,7 @@ function _add_post_type_submenus() {
  * @param string       $post_type The post type for which to add the feature.
  * @param string|array $feature   The feature being added, accepts an array of
  *                                feature strings or a single string.
+ * @param mixed        ...$args   Optional extra arguments to pass along with certain features.
  */
 function add_post_type_support( $post_type, $feature ) {
 	global $_wp_post_type_features;
diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 1682fdbdab..b6b0989a3e 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -2318,6 +2318,14 @@ function get_theme_starter_content() {
  * If attached to a hook, it must be {@see 'after_setup_theme'}.
  * The {@see 'init'} hook may be too late for some features.
  *
+ * Example usage:
+ *
+ *     add_theme_support( 'title-tag' );
+ *     add_theme_support( 'custom-logo', array(
+ *         'height' => 480,
+ *         'width'  => 720,
+ *     ) );
+ *
  * @since 2.9.0
  * @since 3.6.0 The `html5` feature was added
  * @since 3.9.0 The `html5` feature now also accepts 'gallery' and 'caption'
@@ -2636,11 +2644,17 @@ function _custom_logo_header_styles() {
 /**
  * Gets the theme support arguments passed when registering that support
  *
+ * Example usage:
+ *
+ *     get_theme_support( 'custom-logo' );
+ *     get_theme_support( 'custom-header', 'width' );
+ *
  * @since 3.1.0
  *
  * @global array $_wp_theme_features
  *
  * @param string $feature The feature to check.
+ * @param mixed  ...$args Optional extra arguments to be checked against certain features.
  * @return mixed The array of extra arguments or the value for the registered feature.
  */
 function get_theme_support( $feature ) {
@@ -2751,11 +2765,17 @@ function _remove_theme_support( $feature ) {
 /**
  * Checks a theme's support for a given feature.
  *
+ * Example usage:
+ *
+ *     current_theme_supports( 'custom-logo' );
+ *     current_theme_supports( 'html5', 'comment-form' );
+ *
  * @since 2.9.0
  *
  * @global array $_wp_theme_features
  *
  * @param string $feature The feature being checked.
+ * @param mixed  ...$args Optional extra arguments to be checked against certain features.
  * @return bool True if the current theme supports the feature, false otherwise.
  */
 function current_theme_supports( $feature ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index efb208d174..b926a36190 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45421';
+$wp_version = '5.3-alpha-45422';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.