diff --git a/lib/Cake/Network/Http/HttpSocket.php b/lib/Cake/Network/Http/HttpSocket.php
index ebebad62c..5ffd4f8cd 100644
--- a/lib/Cake/Network/Http/HttpSocket.php
+++ b/lib/Cake/Network/Http/HttpSocket.php
@@ -936,6 +936,9 @@ class HttpSocket extends CakeSocket {
 /**
  * Builds cookie headers for a request.
  *
+ * Cookies can either be in the format returned in responses, or
+ * a simple key => value pair.
+ *
  * @param array $cookies Array of cookies to send with the request.
  * @return string Cookie header string to be sent with the request.
  */