diff --git a/docs/index.rst b/docs/index.rst
index 73794f03..2e5ea67f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -99,6 +99,7 @@ The supported types are:
 * ``Decimal``
 * ``str``
 * ``datetime``
+* ``timedelta``
 * ``date``
 * ``time``
 * ``list``