diff --git a/Fake LE Intermediate X1.cer b/Fake LE Intermediate X1.cer
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diff --git a/README.md b/README.md
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+++ b/README.md
@@ -104,4 +104,7 @@ docker run -d \
         }
     ]
 }
-```
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+```
+
+## Staging Certificate
+https://letsencrypt.org/docs/staging-environment/
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