In my opinion we don't need to change anything here. Everything that needs to be explained is already there.

```
# Returns a chainable relation with zero records, specifically an
# instance of the <tt>ActiveRecord::NullRelation</tt> class.
```

```
# Used in cases where a method or scope could return zero records but the
# result needs to be chainable.
```

I see two options here. Leave it as it is, or remove that comment. But I prefer to leave it as it is.