Add google.auth.impersonated_credentials (#299)
diff --git a/docs/index.rst b/docs/index.rst
index 56e3eca..1eb3d86 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -16,6 +16,7 @@
- Support for signing and verifying :mod:`JWTs <google.auth.jwt>`.
- 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>`.
- Support for :mod:`Google Compute Engine credentials <google.auth.compute_engine>`.
- Support for :mod:`Google App Engine standard credentials <google.auth.app_engine>`.
- Support for various transports, including