You may recall this was part of what helped Hillary to cheat past Bernie and come out ahead even where he may have had more votes.
Via Fox News:
The Democratic National Committee voted Saturday to limit the influence of superdelegates — part of a series of changes to the presidential nominating process to reunite the party after a fractious 2016 primary process.
The reforms, passed at the body’s summer meeting in Chicago, include a measure that requires superdelegates to refrain from voting on the first presidential nomination ballot, unless a candidate has enough votes from pledged delegates.
Superdelegates are the party’s most high-profile members and include governors, members of Congress, mayors and others, and represent 15 percent of the overall delegate count.
The reform means that for the initial vote, candidates will only be able to count on the delegates they won during state primaries and caucuses. If there is need for a second ballot, then superdelegates — who are not bound to a candidate — can step in.