diff --git a/third_party/2and3/yaml/__init__.pyi b/third_party/2and3/yaml/__init__.pyi
index 68e26d97b..2362f6a56 100644
--- a/third_party/2and3/yaml/__init__.pyi
+++ b/third_party/2and3/yaml/__init__.pyi
@@ -6,8 +6,7 @@ from yaml.nodes import *  # noqa: F403
 from yaml.loader import *  # noqa: F403
 from yaml.dumper import *  # noqa: F403
 from . import resolver  # Help mypy a bit; this is implied by loader and dumper
-# TODO: stubs for cyaml?
-# from cyaml import *
+from .cyaml import *
 
 __with_libyaml__ = ...  # type: Any
 
diff --git a/third_party/2and3/yaml/cyaml.pyi b/third_party/2and3/yaml/cyaml.pyi
new file mode 100644
index 000000000..ad2322d2d
--- /dev/null
+++ b/third_party/2and3/yaml/cyaml.pyi
@@ -0,0 +1,20 @@
+from typing import Text, Union
+from typing_extensions import Protocol
+
+from yaml.constructor import BaseConstructor, SafeConstructor
+from yaml.resolver import BaseResolver, Resolver
+
+class _Readable(Protocol):
+    def read(self, size: int) -> Union[Text, bytes]: ...
+
+class CParser:
+    def __init__(self, stream: Union[str, bytes, _Readable]) -> None: ...
+
+class CBaseLoader(CParser, BaseConstructor, BaseResolver):
+    def __init__(self, stream: Union[str, bytes, _Readable]) -> None: ...
+
+class CLoader(CParser, SafeConstructor, Resolver):
+    def __init__(self, stream: Union[str, bytes, _Readable]) -> None: ...
+
+class CSafeLoader(CParser, SafeConstructor, Resolver):
+    def __init__(self, stream: Union[str, bytes, _Readable]) -> None: ...