[Home](./index.md) > [bitburner](./bitburner.md) > [WarehouseAPI](./bitburner.warehouseapi.md) > [limitMaterialProduction](./bitburner.warehouseapi.limitmaterialproduction.md) ## WarehouseAPI.limitMaterialProduction() method Limit Material Production. Signature: ```typescript limitMaterialProduction( divisionName: string, city: CityName | `${CityName}`, materialName: string, qty: number, ): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | divisionName | string | Name of the division. | | city | [CityName](./bitburner.cityname.md) \| \`${[CityName](./bitburner.cityname.md)}\` | Name of the city. | | materialName | string | Name of the material. | | qty | number | Amount to limit to. Pass a negative value to remove the limit instead. | Returns: void