That's correct. Each tax year you can use $3,000 ($1,500 for married filing separately) of your capital loss carryover to offset ordinary income, even if you do not have other capital gains or losses in that year.

If you have no gains in 2018 and a further $6,000 loss, you will have a $6,000 loss carryover to 2019 tax year. ($9,000 - $3,000 (2018 deducted).