What is "Other Contributions Previously Taxed by Mass." in the "Taxable IRA/Keogh Distributions" section of Mass. state return? I maxed out a backdoor roth this year.

The section says: "Total IRA/Keogh plan distributions received during 2020 are $6,000. To determine the taxable amount for Massachusetts, enter the following information...".  "Other Contributions Previously Tax by Massachusetts" - should this be $6,000 since I completed a Backdoor Roth so my $6,000 distributions were initially post-tax contributions to a Traditional IRA and then converted to a Roth IRA?