ZSNES is written mostly in Assembly.
Across all Assembly projects on Ohloh, 14% of all source code lines are comments. For ZSNES, this figure is only 5%.
This lack of comments puts ZSNES among the lowest 10% of all Assembly projects on Ohloh.
A high number of comments might indicate that the code is well-documented and organized, and could be a sign of a helpful and disciplined development team.