Add documentation for tz.win module
diff --git a/docs/index.rst b/docs/index.rst
index 244ae5f..05536dd 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -24,6 +24,7 @@
    relativedelta
    rrule
    tz
+   tz.win <tzwin>
    utils
    zoneinfo
    examples