# after_burn · FT4 Rell API · Chromia Docs (concept)

> @extendable function after_ burn(account: account , asset: asset , amount: big_ integer) Extendable function that allows the developer to add more function

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.assets/after_burn/

FUNCTION

# after\_burn

```signature
@extendable function after_burn(account: account, asset: asset, amount: big_integer)
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/assets/extensions.rell#lines-104)

Extendable function that allows the developer to add more functionality to the
`burn` function, after the burn happens.

This allows, for example, to check that any given condition is present after
the tokens have been burned.

If this function throws an exception, the asset will not be burned.

Throws if any extension of this function throws.

**Parameters**

* **account** — the account that has lost the burned tokens
* **asset** — the asset that has been burned
* **amount** — the amount of tokens that have been burned

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.assets/after_burn.html)Generated API reference, mirrored from the live docs