diff --git a/fastapi/exceptions.py b/fastapi/exceptions.py
index 1a3abd80c..773b83857 100644
--- a/fastapi/exceptions.py
+++ b/fastapi/exceptions.py
@@ -41,6 +41,7 @@ class HTTPException(StarletteHTTPException):
         return {"item": items[item_id]}
     ```
     """
+    detail: Any
 
     def __init__(
         self,