diff --git a/in/public/web/nginx/configure.rst b/in/public/web/nginx/configure.rst
index 5ec9b06..950e195 100644
--- a/in/public/web/nginx/configure.rst
+++ b/in/public/web/nginx/configure.rst
@@ -3,4 +3,6 @@ Configure
 
 * /etc/nginx/nginx.conf
 
+.. warning:: define headers at 1 place only
+
 .. todo:: extract from server