def replyToComment(self, repo_user, repo_name, pull_number,
                       body, in_reply_to):
        """
        POST /repos/:owner/:repo/pulls/:number/comments

        Like create, but reply to an existing comment.

        :param body: The text of the comment.
        :param in_reply_to: The comment ID to reply to.
        """
        return self.api.makeRequest(
            ["repos", repo_user, repo_name,
             "pulls", str(pull_number), "comments"],
            method="POST",
            data=dict(body=body,
                      in_reply_to=in_reply_to))