Few source code comments
Debian GNU/Linux is written mostly in shell script.
Across all shell script projects on Ohloh, 13% of all source code lines are comments. For Debian GNU/Linux, this figure is only 7%.
This lack of comments puts Debian GNU/Linux among the lowest one-third of all shell script 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.