imm 5406 after divorce

[canaspirant18]

I HAVE SUBMITTED ALL DOCUMENTS AND RECEIVED AOR & MED PASSED. I AM DIVORCED AND SINGLE APPLICANT WITH MY KID(MINOR). CIC ASKED ME TO SUBMIT imm 5406 ADDITIONAL INFORMATION FORM WITH SIGN IN INK.
CAN ANYONE TELL ME WHETHER I NEED TO MENTION MY EX INFO IN SECTION A (SPOUSE OR COMMON LAW PARTNER) OR LEAVE IT BLANK?

THANKS IN ADVANCE.