diff --git a/book/http_cache.rst b/book/http_cache.rst
index dc765e7d4db..348336b9eeb 100644
--- a/book/http_cache.rst
+++ b/book/http_cache.rst
@@ -1207,6 +1207,12 @@ One great advantage of the ESI renderer is that you can make your application
as dynamic as needed and at the same time, hit the application as little as
possible.
+.. caution::
+
+ The fragment listener only responds to signed requests. Requests are only
+ signed when using the fragment renderer and the ``render_esi`` Twig
+ function.
+
.. note::
Once you start using ESI, remember to always use the ``s-maxage``
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