diff --git a/stubs/rx/internal/extensionmethod.pyi b/stubs/rx/internal/extensionmethod.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rx/internal/extensionmethod.pyi
@@ -0,0 +1,8 @@
+# Stubs for rx.internal.extensionmethod (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any, Optional
+
+def extensionmethod(base: Any, name: Optional[Any] = ..., decorator: Optional[Any] = ..., instancemethod: bool = ..., alias: Optional[Any] = ...): ...
+def extensionclassmethod(base: Any, name: Optional[Any] = ..., alias: Optional[Any] = ...): ...