note that Gerrit is used for reviews on README

Fixes golang/oauth2#217.

Change-Id: I251a74b9b26f6b911333bc5d31d0a96a5734ea60
Reviewed-by: Brad Fitzpatrick <>
diff --git a/ b/
index 1643c08..b0ddf3c 100644
--- a/
+++ b/
@@ -63,3 +63,12 @@
+## Contributing
+We appreciate your help!
+To contribute, please read the contribution guidelines:
+Note that the Go project does not use GitHub pull requests but
+uses Gerrit for code reviews. See the contribution guide for details.