Add support for imersonated_credentials.Sign, IDToken (#348)
diff --git a/docs/index.rst b/docs/index.rst
index 1eb3d86..4287c3d 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -14,6 +14,7 @@
- Support for Google :func:`Application Default Credentials <google.auth.default>`.
- Support for signing and verifying :mod:`JWTs <google.auth.jwt>`.
+- Support for creating `Google ID Tokens <user-guide.html#identity-tokens>`__.
- Support for verifying and decoding :mod:`ID Tokens <google.oauth2.id_token>`.
- Support for Google :mod:`Service Account credentials <google.oauth2.service_account>`.
- Support for Google :mod:`Impersonated Credentials <google.auth.impersonated_credentials>`.