Where this document belongs alongside your passport and visa.
For any trip involving driving abroad, a complete document checklist typically includes your passport, any required visa, your home driver's license, and an international driving permit where relevant, all organized together. Treating these as one document set rather than separate items reduces the chance of forgetting one.
Checking this full list against your specific destination's requirements a few weeks before departure, rather than the night before, gives enough time to address any gaps.