Increase mortgage payment via online banking???

Hey everyone.

I currently have my mortgage through BMO and my main bank is through RBC. Mortgage payments are automatically debited from my RBC account.

My question is...

Is there a way that I can increase my mortgage payments to BMO through my online RBC account?

I know I could walk into any BMO branch and make an additional mortgage deposit, but was hoping there was an easier way by using my online RBC account.

Any suggestions would be appreciated.

Cheers!