diff --git a/tests/test-doctest.py b/tests/test-doctest.py
new file mode 100644
--- /dev/null
+++ b/tests/test-doctest.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+#
+
+import doctest
+
+import mercurial.changelog
+# test doctest from changelog
+
+doctest.testmod(mercurial.changelog)
+