Tvheadend

When I look at EPG I see `Title` and `Extra text`. The tooltip on `Extra text` says `Extra text: subtitle or summary or description`. So how can one knows what is this?

I am wondering this because I am trying to make non-repeating autorec entries. There the options are `Record if different` - `subtitle` or `description`. The help says:

Record if different subtitle        Record a matching event only if the subtitle is different.
Record if different description     Record a matching event only if the description is different.

So, how do I know that in EPG I see subtitle, summary or description in the `Extra text` field?

or the `Record if different` - `subtitle` and `description` are same settings with different name?

Seems to be kind of confusing?