Nginx config documentation is one of the best I've seen. Things I like which are not common: 1. It specifies in which version a feature was introduced (if it was not present if first public release) 2. It is easy to send a link pointing to description of a specific directive e. g. http://nginx.org/r/env 3. For each directive docs tell a default value. It seems obvious that any decent documentation should have this but I've seen software for which it is hard to find out default values so you have to add into config many values just in case even if they are not different from defaults.
Comments
Nginx config documentation is one of the best I've seen. Things I like which are not common: 1. It specifies in which version a feature was introduced (if it was not present if first public release) 2. It is easy to send a link pointing to description of a specific directive e. g. http://nginx.org/r/env 3. For each directive docs tell a default value. It seems obvious that any decent documentation should have this but I've seen software for which it is hard to find out default values so you have to add into config many values just in case even if they are not different from defaults.