Just want to share something here,
I am getting lot of personal messages from people who have received email request from CIC for "additional documents".
Looks like CIC is asking evidence of relationship documents to everyone who have included spouse during the later stages of the application process.
If anyone considering or already included spouse during your ongoing application, expect this kind of email from CIC.
Try to collect all supporting documents such as marriage photos,email conversation,phone bills, financial support etc.