Will all ratings/comments be lost if I change something on the Performance template?

Summary

Want to change the ability for Participant comments to show on a Performance document but want to make sure when template is updated, info will not be lost.

Content

Want to change the ability for Participant comments to show on a Performance document but want to make sure when template is updated, info will not be lost.  Can anyone confirm whether or not information that has already been entered by the employee and manager will not be lost if I make a change to the template?

Thanks,

Kelly