diff --git a/docs/topics/downloader-middleware.rst b/docs/topics/downloader-middleware.rst
index 983a93290..863620900 100644
--- a/docs/topics/downloader-middleware.rst
+++ b/docs/topics/downloader-middleware.rst
@@ -237,6 +237,17 @@ Default: ``True``
 Whether to enable the cookies middleware. If disabled, no cookies will be sent
 to web servers.
 
+Notice that if the :class:`~scrapy.http.Request` 
+has ``meta['dont_merge_cookies']`` evaluated to ``True``. 
+despite the value of :setting:`COOKIES_ENABLED` the cookies will **not** be 
+sent to web servers and received cookies in 
+:class:`~scrapy.http.Response` will **not** be merged with the existing 
+cookies.
+
+For more detailed information see the ``cookies`` parameter in 
+:class:`~scrapy.http.Request`
+
+
 .. setting:: COOKIES_DEBUG
 
 COOKIES_DEBUG