diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 640ca6f910..ac8aaa52d2 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -7,7 +7,17 @@
  */
 
 /**
- * Map meta capabilities to primitive capabilities.
+ * Maps meta capabilities to primitive capabilities.
+ *
+ * This function also accepts an ID of an object to map against if the capability is a meta capability. Meta
+ * capabilities such as `edit_post` and `edit_user` are capabilities used by this function to map to primitive
+ * capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+ *
+ * Example usage:
+ *
+ *     map_meta_cap( 'edit_posts', $user->ID );
+ *     map_meta_cap( 'edit_post', $user->ID, $post->ID );
+ *     map_meta_cap( 'edit_post_meta', $user->ID, $post->ID, $meta_key );
  *
  * This does not actually compare whether the user ID has the actual capability,
  * just what the capability or capabilities are. Meta capability list value can
@@ -18,12 +28,9 @@
  *
  * @global array $post_type_meta_caps Used to get post type meta capabilities.
  *
- * @param string $cap       Capability name.
- * @param int    $user_id   User ID.
- * @param int    $object_id Optional. ID of the specific object to check against if `$cap` is a "meta" cap.
- *                          "Meta" capabilities, e.g. 'edit_post', 'edit_user', etc., are capabilities used
- *                          by map_meta_cap() to map to other "primitive" capabilities, e.g. 'edit_posts',
- *                          'edit_others_posts', etc. The parameter is accessed via func_get_args().
+ * @param string $cap     Capability name.
+ * @param int    $user_id User ID.
+ * @param mixed  ...$args Optional further parameters, typically starting with an object ID.
  * @return array Actual capabilities for meta capability.
  */
 function map_meta_cap( $cap, $user_id ) {
@@ -615,7 +622,17 @@ function map_meta_cap( $cap, $user_id ) {
 }
 
 /**
- * Whether the current user has a specific capability.
+ * Returns whether the current user has the specified capability.
+ *
+ * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+ * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+ * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+ *
+ * Example usage:
+ *
+ *     current_user_can( 'edit_posts' );
+ *     current_user_can( 'edit_post', $post->ID );
+ *     current_user_can( 'edit_post_meta', $post->ID, $meta_key );
  *
  * While checking against particular roles in place of a capability is supported
  * in part, this practice is discouraged as it may produce unreliable results.
@@ -628,11 +645,7 @@ function map_meta_cap( $cap, $user_id ) {
  * @see map_meta_cap()
  *
  * @param string $capability Capability name.
- * @param int    $object_id  Optional. ID of the specific object to check against if `$capability` is a "meta" cap.
- *                           "Meta" capabilities, e.g. 'edit_post', 'edit_user', etc., are capabilities used
- *                           by map_meta_cap() to map to other "primitive" capabilities, e.g. 'edit_posts',
- *                           'edit_others_posts', etc. Accessed via func_get_args() and passed to WP_User::has_cap(),
- *                           then map_meta_cap().
+ * @param mixed  ...$args    Optional further parameters, typically starting with an object ID.
  * @return bool Whether the current user has the given capability. If `$capability` is a meta cap and `$object_id` is
  *              passed, whether the current user has the given meta capability for the given object.
  */
@@ -650,12 +663,23 @@ function current_user_can( $capability ) {
 }
 
 /**
- * Whether the current user has a specific capability for a given site.
+ * Returns whether the current user has the specified capability for a given site.
+ *
+ * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+ * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+ * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+ *
+ * Example usage:
+ *
+ *     current_user_can_for_blog( $blog_id, 'edit_posts' );
+ *     current_user_can_for_blog( $blog_id, 'edit_post', $post->ID );
+ *     current_user_can_for_blog( $blog_id, 'edit_post_meta', $post->ID, $meta_key );
  *
  * @since 3.0.0
  *
  * @param int    $blog_id    Site ID.
  * @param string $capability Capability name.
+ * @param mixed  ...$args    Optional further parameters, typically starting with an object ID.
  * @return bool Whether the user has the given capability.
  */
 function current_user_can_for_blog( $blog_id, $capability ) {
@@ -683,12 +707,23 @@ function current_user_can_for_blog( $blog_id, $capability ) {
 }
 
 /**
- * Whether the author of the supplied post has a specific capability.
+ * Returns whether the author of the supplied post has the specified capability.
+ *
+ * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+ * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+ * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+ *
+ * Example usage:
+ *
+ *     author_can( $post, 'edit_posts' );
+ *     author_can( $post, 'edit_post', $post->ID );
+ *     author_can( $post, 'edit_post_meta', $post->ID, $meta_key );
  *
  * @since 2.9.0
  *
  * @param int|WP_Post $post       Post ID or post object.
  * @param string      $capability Capability name.
+ * @param mixed       ...$args    Optional further parameters, typically starting with an object ID.
  * @return bool Whether the post author has the given capability.
  */
 function author_can( $post, $capability ) {
@@ -709,12 +744,23 @@ function author_can( $post, $capability ) {
 }
 
 /**
- * Whether a particular user has a specific capability.
+ * Returns whether a particular user has the specified capability.
+ *
+ * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+ * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+ * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+ *
+ * Example usage:
+ *
+ *     user_can( $user->ID, 'edit_posts' );
+ *     user_can( $user->ID, 'edit_post', $post->ID );
+ *     user_can( $user->ID, 'edit_post_meta', $post->ID, $meta_key );
  *
  * @since 3.1.0
  *
  * @param int|WP_User $user       User ID or object.
  * @param string      $capability Capability name.
+ * @param mixed       ...$args    Optional further parameters, typically starting with an object ID.
  * @return bool Whether the user has the given capability.
  */
 function user_can( $user, $capability ) {
diff --git a/wp-includes/class-wp-user.php b/wp-includes/class-wp-user.php
index 29c75b60f8..f8ead23d87 100644
--- a/wp-includes/class-wp-user.php
+++ b/wp-includes/class-wp-user.php
@@ -712,7 +712,17 @@ class WP_User {
 	}
 
 	/**
-	 * Whether the user has a specific capability.
+	 * Returns whether the user has the specified capability.
+	 *
+	 * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+	 * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+	 * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+	 *
+	 * Example usage:
+	 *
+	 *     $user->has_cap( 'edit_posts' );
+	 *     $user->has_cap( 'edit_post', $post->ID );
+	 *     $user->has_cap( 'edit_post_meta', $post->ID, $meta_key );
 	 *
 	 * While checking against a role in place of a capability is supported in part, this practice is discouraged as it
 	 * may produce unreliable results.
@@ -721,12 +731,9 @@ class WP_User {
 	 *
 	 * @see map_meta_cap()
 	 *
-	 * @param string $cap          Capability name.
-	 * @param int    ...$object_id Optional. ID of a specific object to check against if `$cap` is a "meta" capability.
-	 *                             Meta capabilities such as `edit_post` and `edit_user` are capabilities used by
-	 *                             by the `map_meta_cap()` function to map to primitive capabilities that a user or
-	 *                             role has, such as `edit_posts` and `edit_others_posts`.
-	 * @return bool Whether the user has the given capability, or, if `$object_id` is passed, whether the user has
+	 * @param string $cap     Capability name.
+	 * @param mixed  ...$args Optional further parameters, typically starting with an object ID.
+	 * @return bool Whether the user has the given capability, or, if an object ID is passed, whether the user has
 	 *              the given capability for that object.
 	 */
 	public function has_cap( $cap ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 22cc08730a..9accb1aab1 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45418';
+$wp_version = '5.3-alpha-45419';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.