diff --git a/src/wp-admin/includes/class-automatic-upgrader-skin.php b/src/wp-admin/includes/class-automatic-upgrader-skin.php
index 9875c6dee5..32cef43dfb 100644
--- a/src/wp-admin/includes/class-automatic-upgrader-skin.php
+++ b/src/wp-admin/includes/class-automatic-upgrader-skin.php
@@ -8,7 +8,7 @@
  */
 
 /**
- * Upgrader Skin for Automatic WordPress Upgrades
+ * Upgrader Skin for Automatic WordPress Upgrades.
  *
  * This skin is designed to be used when no output is intended, all output
  * is captured and stored for the caller to process and log/email/discard.
@@ -52,6 +52,8 @@ class Automatic_Upgrader_Skin extends WP_Upgrader_Skin {
 	}
 
 	/**
+	 * Gets the messages.
+	 *
 	 * @return array
 	 */
 	public function get_upgrade_messages() {
@@ -59,7 +61,9 @@ class Automatic_Upgrader_Skin extends WP_Upgrader_Skin {
 	}
 
 	/**
-	 * @param string|array|WP_Error $data
+	 * Adds feedback about the data to the messages.
+	 *
+	 * @param string|array|WP_Error $data    The data to give feedback on.
 	 * @param mixed                 ...$args Optional text replacements.
 	 */
 	public function feedback( $data, ...$args ) {
@@ -103,12 +107,14 @@ class Automatic_Upgrader_Skin extends WP_Upgrader_Skin {
 	}
 
 	/**
+	 * Creates a new output buffer and starts to write to it.
 	 */
 	public function header() {
 		ob_start();
 	}
 
 	/**
+	 * Gets the current buffering contents, deletes the current output buffer, and applies feedback to the output.
 	 */
 	public function footer() {
 		$output = ob_get_clean();