Index: src/wp-includes/http.php
===================================================================
--- src/wp-includes/http.php	(revision 36392)
+++ src/wp-includes/http.php	(working copy)
@@ -443,7 +443,7 @@
  * @since 3.4.0
  *
  * @param null|string $origin Origin URL. If not provided, the value of get_http_origin() is used.
- * @return string True if the origin is allowed. False otherwise.
+ * @return string URL of the origin if allowed or empty string if not.
  */
 function is_allowed_http_origin( $origin = null ) {
 	$origin_arg = $origin;
@@ -459,7 +459,7 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $origin     Result of check for allowed origin.
+	 * @param string $origin     Origin URL if allowed. Empty string if not allowed.
 	 * @param string $origin_arg Original origin string passed into is_allowed_http_origin function.
 	 */
 	return apply_filters( 'allowed_http_origin', $origin, $origin_arg );