diff --git a/stdlib/2and3/datetime.pyi b/stdlib/2and3/datetime.pyi
index a721cb765..9c4031ad5 100644
--- a/stdlib/2and3/datetime.pyi
+++ b/stdlib/2and3/datetime.pyi
@@ -72,8 +72,10 @@ class date:
     def __gt__(self, other: date) -> bool: ...
     if sys.version_info >= (3, 8):
         def __add__(self: _S, other: timedelta) -> _S: ...
+        def __radd__(self: _S, other: timedelta) -> _S: ...
     else:
         def __add__(self, other: timedelta) -> date: ...
+        def __radd__(self, other: timedelta) -> date: ...
     @overload
     def __sub__(self, other: timedelta) -> date: ...
     @overload
@@ -299,8 +301,10 @@ class datetime(date):
     def __gt__(self, other: datetime) -> bool: ...  # type: ignore
     if sys.version_info >= (3, 8):
         def __add__(self: _S, other: timedelta) -> _S: ...
+        def __radd__(self: _S, other: timedelta) -> _S: ...
     else:
         def __add__(self, other: timedelta) -> datetime: ...
+        def __radd__(self, other: timedelta) -> datetime: ...
     @overload  # type: ignore
     def __sub__(self, other: datetime) -> timedelta: ...
     @overload