Koturu, what do you mean by your sups having contributed to your thesis? Your supservisors are there to provide comments, guidance etc, but should not be contributing to your thesis - this is your work, not a joint production. There should not be any way whatever in which your supervisors are contributing to your thesis so much that you think they should be co-authors on authors arising from your thesis. If this is just the normal process of supervision, don't give them co-authorship - this is your work, and their comments are supervision, not co-authorship.