diff --git a/stdlib/2/whichdb.pyi b/stdlib/2/whichdb.pyi
new file mode 100644
index 000000000..b1a69f481
--- /dev/null
+++ b/stdlib/2/whichdb.pyi
@@ -0,0 +1,5 @@
+# Source: https://hg.python.org/cpython/file/2.7/Lib/whichdb.py
+
+from typing import Optional, Text
+
+def whichdb(filename: Text) -> Optional[str]: ...