diff --git a/cookbook/cache/varnish.rst b/cookbook/cache/varnish.rst
index da06add99f1..7dd46d9a11f 100644
--- a/cookbook/cache/varnish.rst
+++ b/cookbook/cache/varnish.rst
@@ -38,6 +38,11 @@ application:
set req.http.Surrogate-Capability = "abc=ESI/1.0";
}
+.. note::
+
+ The ``abc`` part of the header isn't important unless you have multiple "surrogates"
+ that need to advertise their capabilities. See `Surrogate-Capability Header`_ for details.
+
Then, optimize Varnish so that it only parses the Response contents when there
is at least one ESI tag by checking the ``Surrogate-Control`` header that
Symfony2 adds automatically:
@@ -217,3 +222,4 @@ absolute URLs:
.. _`Varnish`: https://www.varnish-cache.org
.. _`Edge Architecture`: http://www.w3.org/TR/edge-arch
.. _`GZIP and Varnish`: https://www.varnish-cache.org/docs/3.0/phk/gzip.html
+.. _`Surrogate-Capability Header`: http://www.w3.org/TR/edge-arch
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