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-rw-r--r--docs/ref/clickjacking.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/ref/clickjacking.txt b/docs/ref/clickjacking.txt
index b7ba915eee..06d264c115 100644
--- a/docs/ref/clickjacking.txt
+++ b/docs/ref/clickjacking.txt
@@ -45,6 +45,9 @@ site:
2. A set of view decorators that can be used to override the middleware or to
only set the header for certain views.
+The ``X-Frame-Options`` HTTP header will only be set by the middleware or view
+decorators if it is not already present in the response.
+
How to use it
=============