Embedded Form _mktoReferrer value in Alert

[Anonymous]

We have the same form on multiple pages on our site (a general contact us). It would be helpful to alert somebody when the form was submitted, but also include what page it was filled out on. I can see that in the "filled out form" activity record - but can't figure out a way to get that in the notification...

Has anybody had this issue before?

I thought I could create a field on the lead record and make it hidden on the form itself, but I dont see an option for the referrer URL, only a referrer param.