diff --git a/stubs/DateTimeRange/datetimerange/__init__.pyi b/stubs/DateTimeRange/datetimerange/__init__.pyi
index 94e3179cc..4da26321b 100644
--- a/stubs/DateTimeRange/datetimerange/__init__.pyi
+++ b/stubs/DateTimeRange/datetimerange/__init__.pyi
@@ -23,7 +23,7 @@ class DateTimeRange:
     def __iadd__(self: Self, other: datetime.timedelta) -> Self: ...
     def __sub__(self, other: datetime.timedelta) -> DateTimeRange: ...
     def __isub__(self: Self, other: datetime.timedelta) -> Self: ...
-    def __contains__(self, x: datetime.timedelta | DateTimeRange | str) -> bool: ...
+    def __contains__(self, x: datetime.timedelta | datetime.datetime | DateTimeRange | str) -> bool: ...
     @property
     def start_datetime(self) -> datetime.datetime: ...
     @property