diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index f134d5e6a2..1028e2df56 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -1892,6 +1892,7 @@ function wp_update_user($userdata) {
 			// Here we calculate the expiration length of the current auth cookie and compare it to the default expiration.
 			// If it's greater than this, then we know the user checked 'Remember Me' when they logged in.
 			$logged_in_cookie    = wp_parse_auth_cookie( '', 'logged_in' );
+			/** This filter is documented in wp-includes/pluggable.php */
 			$default_cookie_life = apply_filters( 'auth_cookie_expiration', ( 2 * DAY_IN_SECONDS ), $ID, false );
 			$remember            = ( ( $logged_in_cookie['expiration'] - time() ) > $default_cookie_life );