Name the partner and the data
Do not write only "we use third parties." Name the ad network or SDK category and explain whether it uses cookies, advertising IDs, device identifiers, location, usage data, or purchase signals.
Explain consent and opt-outs
For EU, UK, and similar traffic, describe consent collection. For mobile apps, mention platform-level controls such as iOS tracking permission and Android advertising ID reset options.
Keep app-ads.txt aligned
Your public policy and app-ads.txt file serve different jobs, but they should tell a consistent story about who sells or measures ads for your inventory.