Add the following (or something similar) to the part about our sister sites:
We have sister sites:
- ...
- All these sites are part of the StackExchange network, which covers a broad range of topics.
Reason: Thankfully, they are seldom, but I've seen questions here covering topics like games and computer science. Also, I believe most new users don't understand that SF is part of a whole network of sites, and with this line we make the reference explicit, not just an unexplained link in the title of that section.