Is there a way to note the lead source when you manually enter a showing? For example, if someone found one of my listings through Zillow and they cal?

Is there a way to note the lead source when you manually enter a showing? For example, if someone found one of my listings through Zillow and they called to schedule a showing instead of using the ShowMojo link and I added the showing manually using “+ New Showing” from my dashboard, is there a place to enter the source of the lead so that it would be included in the reports.