In a sign federal regulators are taking the behemoth merger of Charter Communications, Time Warner Cable, and Bright House Networks seriously, the FCC today announced it was temporarily stopping the clock on the merger review required to approve or reject it.

“The commission has a strong interest in ensuring a full and complete record upon which to base its decision in this proceeding,” the FCC wrote in a statement. “Pausing the clock will ensure that commenters have sufficient time to review and comment on this new information, and will provide commission staff with the necessary time to review both the applicants’ materials and any responses.”

The delay is expected to last at least 15 days. The FCC considers such mergers under an informal 180-day “shot clock” that was designed to make certain mergers under review would receive prompt consideration by regulators. But the FCC treats the clock as a suggestion, not a mandate, and has often delayed contentious mergers, sometimes to a degree where the parties involved recognize the direction the review is headed, and withdraw their application.

Charter insists that is not the case here.

“We have recently submitted supplemental information to underscore the benefits of these transactions and it is expected that the FCC would want to give the public time to comment,” Charter said in a statement. “We are working well with the FCC on its review of our deal and continue to look forward to a timely approval.”

Comcast said the same thing when its merger application for Time Warner Cable stalled in federal and state regulators’ offices. Its merger application was eventually voluntarily withdrawn.