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-rw-r--r--docs/ref/checks.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/ref/checks.txt b/docs/ref/checks.txt
index 05a2e6e88f..3f81720c72 100644
--- a/docs/ref/checks.txt
+++ b/docs/ref/checks.txt
@@ -476,6 +476,7 @@ of the :djadmin:`check` command:
``'DENY'``. The default is ``'SAMEORIGIN'``, but unless there is a good reason
for your site to serve other parts of itself in a frame, you should change
it to ``'DENY'``.
+* **security.W020**: :setting:`ALLOWED_HOSTS` must not be empty in deployment.
Sites
-----