diff --git a/src/wp-includes/locale.php b/src/wp-includes/locale.php
index ded33782ba..9ff1159103 100644
--- a/src/wp-includes/locale.php
+++ b/src/wp-includes/locale.php
@@ -78,6 +78,10 @@ class WP_Locale {
 	public $text_direction = 'ltr';
 
 	/**
+	 * The thousands separator and decimal point values used for localizing numbers.
+	 *
+	 * @since 2.3.0
+	 * @access public
 	 * @var array
 	 */
 	public $number_format;