Depends, were you going east or west?
Once 12 miles off shore you are free to go speed of heat.
If you were going east over land he may have been deleting a sid speed restriction of something less than 250 below ten or a restriction to maintain 250 even above 10 ( I seam to recall one of the LAX sids had a maintain 250 till further notice)
The only place on the CONUS currently where you can excede 250 below 10 is Houston which has an ongoing trial of removing the speed restriction.
There maybe several reasons for the push to remove the speed restrictions, one of which is referred to as the "Dallas bump" which is that the rates of climb by some aircraft are so great at 250 knots they they are causing tcas RA's bumping the whole stack up. Also its pretty silly on departure and just costs fuel.
Cheers
Wino