# Gremlin useDFE query hint
<a name="gremlin-query-hints-useDFE"></a>

Use this query hint to enable use of the DFE for executing the query. By default Neptune does not use the DFE without this query hint being set to `true`, because the [neptune\$1dfe\$1query\$1engine](parameters.md#parameters-instance-parameters-neptune_dfe_query_engine) instance parameter defaults to `viaQueryHint`. If you set that instance parameter to `enabled`, the DFE engine is used for all queries except those having the `useDFE` query hint set to `false`.

Example of enabling the DFE for a query:

```
g.withSideEffect('Neptune#useDFE', true).V().out()
```