diff --git a/docs/response.rst b/docs/response.rst
index 9d675fb..42cf1e8 100644
--- a/docs/response.rst
+++ b/docs/response.rst
@@ -93,7 +93,7 @@ Response Serialization
     def endpoint():
         data = "success"
         status_code = 200
-        headers = {"Content-Type": "text/plain}
+        headers = {"Content-Type": "text/plain"}
         return data, status_code, headers
 
 Data