# Custom Functionality Execution Lenders can whitelist any custom functionality for the NFTs they choose to rent out. This way, renters have access only to specific functionalities, preventing them from exhausting key utilities or reward features during the rental period --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.renfter.com/renfter-features/custom-functionality-execution.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.