diff --git a/docs/source/faq.rst b/docs/source/faq.rst
index b728084c..55303122 100644
--- a/docs/source/faq.rst
+++ b/docs/source/faq.rst
@@ -129,7 +129,7 @@ One of the first settings that usually needs to be bumped is the maximum number
 of open file descriptors for a given process. For the confused out there,
 remember that Unices treat sockets as files.
 
-.. warning::
+.. warning:: ``sudo ulimit`` may not work
 Considering non-privileged users are not able to relax the limit, you should
 firstly switch to root user, increase the limit, then run gunicorn. Using ``sudo
 ulimit`` would not take effect.