Facebook has long required the largest application developers on its platform to agree to an additional set of terms that, while undisclosed, appear to be aimed at ensuring site performance quality. The company updated these terms this week to set a higher bar for which apps qualify for those terms.

Here’s the update to the developer policy document:

If you exceed, or plan to exceed, any of the following thresholds please contact us as you may be subject to additional terms: (>5M MAU) or (>100M API calls per day) or (>50M impressions per day).

We asked Facebook for more details on the change. The company’s response:

We recently revised our threshold policy from 5 million daily active users to 5 million monthly active users. We want to work closely with our largest developers in order to maintain a high level of performance, speed and uptime for Facbook Platform. Sudden, unexpected large increases in API usage could negatively impact both developers and users.