This tip came from Butch Harmon. The right heel should be the first part of the foot to move with a slight shift towards the target before turning upwards.
Learning to do this can be particularly helpful for those who spin out or turn the hips without shifting the weight and sliding the hips at all.
This bumping of the hips will help to drop the club onto the inside path on the down swing.
Make sure the club face is square or closed beforehand though as a slicer who fixes the path before the club face is asking for trouble.
To get this right you want to get to the top, start the down swing with the left hip moving laterally towards the target which will pull the heel in the same direction.
Then you can let the foot roll and the heel turn upwards through into the through swing.
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Filmed at Troon.