How to specify enum values in ERD?

[Tomperez98]

I'm using mermaid to document the ERD of a service database. One of the columns has an Enum value, what's the best way to do this?

Current approach.

erDiagram
    user ||--|{ loan: has
    user {
        int id PK
        string phone_number
        string name
        string last_name
        int age
        datetime created_at
        datetime updated_at
    }

    loan {
        int id PK
        int lender_id FK "user.id"
        string  borrower_phone_number
        float loan_amount
        float interest_rate
        BillingPeriod billing_period
        datetime created_at
        datetime updated_at
    }

    BillingPeriod {
        string DAILY
        string WEEKLY
        string MONTHLY
        string YEARLY
    }