diff --git a/swh/loader/cvs/rcsparse.pyi b/swh/loader/cvs/rcsparse.pyi
new file mode 100644
index 0000000..bbd8076
--- /dev/null
+++ b/swh/loader/cvs/rcsparse.pyi
@@ -0,0 +1,3 @@
+from typing import Any
+def __getattr__(name) -> Any: ...
+def rcsfile(path): ...