How to merge 2 table from 2 database different ==> 1 table but can know info of source what?

Hello,

I have problem is I want add a column source_id  to 2  table data source when merge in SSIS

Data source: Customer 1, Customer 2

Customer1(Id, Name, Adress)

Customer2(Id, Name, Adress)

Destination: Customer

Customer (Id, Name, Adress, Source_Id)

1001 |  John    |  123, Abc, USA  | 1 

1002 |  sunny  | USA                  | 2

My English is not good, very sorry :(

Hope to get help!

Thanks,