diff --git a/README.md b/README.md
index 584404c..8f42d57 100644
--- a/README.md
+++ b/README.md
@@ -14,3 +14,4 @@ HTTP_X_GITEA_DELIVERY
 Testing webhook.
 Testing webhook.
 logging.error("1")
+payload_signature = hmac.new(secret_key, content, 'sha256')