StGit: Notice: no parent remote declared for stack

Hi,

I am following another git repository with StGit. In the remote
repository I am following RELENG_1_2 branch.

I created the StGit repository using stg clone and then changed to
RELENG_1_2 branch and did a stg init and edited the
.git/remotes/origin to

URL: /usr/local/upstream/.git
Pull: refs/heads/RELENG_1_2:refs/heads/RELENG_1_2

When I do an stg pull I get the following error:

Notice: no parent remote declared for stack "RELENG_1_2", defaulting
to "origin". Consider setting "branch.RELENG_1_2.remote" and
"branch.RELENG_1_2.merge" with "git repo-config".

What should I set branch.RELENG_1_2.remote and branch.RELENG_1_2.merge
to ? a sample command would be very helpful as I am not very much upto
speed with git repo-config

raj