How to show a definition by Expense type

Summary

We would like to see a brief definition when a user is selecting an expense type

Content

Currently, when an Expense user is entering a record and selects an expense type a small box appears right near the Expense type field but this box only contains exactly the same words than the Expense type itself.

We wonder whether this is a potential candidate for a short definition of each expense type.

Do you know if there is any place to set up this text? we were hoping that this would be based on the Expense type description but it does not seem to be the case.