diff --git a/stdlib/3.7/contextvars.pyi b/stdlib/3.7/contextvars.pyi
index b5c8082aa..6fe499e34 100644
--- a/stdlib/3.7/contextvars.pyi
+++ b/stdlib/3.7/contextvars.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Callable, ClassVar, Generic, Mapping, TypeVar, Union
+from typing import Any, Callable, ClassVar, Generic, Iterator, Mapping, TypeVar, Union
 
 _T = TypeVar('_T')
 
@@ -25,3 +25,6 @@ class Context(Mapping[ContextVar[Any], Any]):
     def __init__(self) -> None: ...
     def run(self, callable: Callable[..., _T], *args: Any, **kwargs: Any) -> _T: ...
     def copy(self) -> Context: ...
+    def __getitem__(self, key: ContextVar[Any]) -> Any: ...
+    def __iter__(self) -> Iterator[ContextVar[Any]]: ...
+    def __len___(self) -> int: ...