diff --git a/http_cache/expiration.rst b/http_cache/expiration.rst
index 9d1169a79a8..d77e682b2a0 100644
--- a/http_cache/expiration.rst
+++ b/http_cache/expiration.rst
@@ -85,5 +85,12 @@ the lifetime calculation vulnerable to clock skew. Another limitation
of the ``Expires`` header is that the specification states that "HTTP/1.1
servers should not send ``Expires`` dates more than one year in the future."
+.. note::
+
+ Accordingly with `RFC 7234 - Caching`_, the ``Expires`` header value is
+ ignored when ``s-maxage`` or ``max-age`` directives are defined.
+
+
.. _`expiration model`: http://tools.ietf.org/html/rfc2616#section-13.2
.. _`FrameworkExtraBundle documentation`: https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/cache.html
+.. _`RFC 7234 - Caching`: https://tools.ietf.org/html/rfc7234#section-4.2.1
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