diff --git a/in/public/web/nginx/serve.rst b/in/public/web/nginx/serve.rst
index a9261b8..56b34b7 100644
--- a/in/public/web/nginx/serve.rst
+++ b/in/public/web/nginx/serve.rst
@@ -34,6 +34,14 @@ Serve
      }
  }
 
+Certificates
+------------
+
+::
+
+ application/x-x509-ca-cert   crt der pem;
+ application/x-x509-user-cert pfx;
+
 Check client certificate
 ------------------------