Can't change terrain tile size from 65x65 to 256x256

Hi I can see there is a flag to set the tile-size when generating tiles, but the tiles .terrain format tiles seems to still be 65*65 even though i set the tiles-size to be 256x256

This is what I wrote 

`ctb-tile --output-format Terrain --tile-size 256 --profile mercator --output-dir outputDir input.tif`
