Blackburn had picked up just one point from three previous games before Saturday's 3-1 home win against Wolves, in which Roberts opened his own scoring account for the campaign.
He said: "We have put a marker down now because we have been playing well recently without getting the rewards.
"Against Wolves, it all came good for us and we could have scored more. But we have to be happy with the chances we made and the goals we got.
"We know now what we are capable because we were not getting what we felt we deserved. Now we must keep plugging away to pull ourselves up the table."