diff --git a/Documentation/security/siphash.rst b/Documentation/security/siphash.rst
index bd9363025fcb..42794a7e052f 100644
--- a/Documentation/security/siphash.rst
+++ b/Documentation/security/siphash.rst
@@ -121,12 +121,12 @@ even scarier, uses an easily brute-forcable 64-bit key (with a 32-bit output)
 instead of SipHash's 128-bit key. However, this may appeal to some
 high-performance `jhash` users.
 
-Danger!
-
-Do not ever use HalfSipHash except for as a hashtable key function, and only
-then when you can be absolutely certain that the outputs will never be
-transmitted out of the kernel. This is only remotely useful over `jhash` as a
-means of mitigating hashtable flooding denial of service attacks.
+.. warning::
+   Do not ever use HalfSipHash except for as a hashtable key function, and
+   only then when you can be absolutely certain that the outputs will never
+   be transmitted out of the kernel. This is only remotely useful over
+   `jhash` as a means of mitigating hashtable flooding denial of service
+   attacks.
 
 Generating a HalfSipHash key
 ============================