diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 26d491bea..6f741c6bc 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -1,3 +1,4 @@
+import http.client
 from typing import Any, Dict, List, Optional, Sequence, Tuple, Type, cast
 
 from fastapi import routing
@@ -187,7 +188,10 @@ def get_openapi_path(
                         response.setdefault("content", {}).setdefault(
                             "application/json", {}
                         )["schema"] = response_schema
-                    response.setdefault("description", "Additional Response")
+                    status_text = http.client.responses.get(int(additional_status_code))
+                    response.setdefault(
+                        "description", status_text or "Additional Response"
+                    )
                     operation.setdefault("responses", {})[
                         str(additional_status_code)
                     ] = response
diff --git a/tests/test_tutorial/test_additional_responses/test_tutorial001.py b/tests/test_tutorial/test_additional_responses/test_tutorial001.py
index 7ab350e8d..5036afda2 100644
--- a/tests/test_tutorial/test_additional_responses/test_tutorial001.py
+++ b/tests/test_tutorial/test_additional_responses/test_tutorial001.py
@@ -12,7 +12,7 @@ openapi_schema = {
             "get": {
                 "responses": {
                     "404": {
-                        "description": "Additional Response",
+                        "description": "Not Found",
                         "content": {
                             "application/json": {
                                 "schema": {"$ref": "#/components/schemas/Message"}