I read in a document that A will synchronize with B after a procedure.

My question is:

After the synchronization, will A be equal with B, or will B be equal with A?

Edit:

I want to clarify why I ask this question.

The document I am referring to, instructs me that I should change the content of A.

After the change, A will then synchronize with B. I find this a bit odd, as my change would be reverted. I would expect the synchronization would be in the other direction.

I need some clarification on this matter. I not yet sure if the procedure is correctly described.