Changelog mentions recursive directory watching, but TODO say that it is absent, and incrontab(5) (where it could be well described) mention it only marginally.
Possibility to use shell patterns? regexps? in incrontab's watched path is nearly undocumented (but there is example).
There is no documented syntax for the separator between items. In v0.5.10- was (IMHO) only one space allowed, now is in Changelog that may be tabs (one? sequence? can be mixed with space(s)?) also, but without clarification.
There is documentation for a "*.mp3" mask, but using similar masks doesn't seem to actually work out in 0.5.12. Once I specify a mask incron events no longer occur,
An "inotify.h" file is referenced that doesn't exist
There are some vaguenesses in doc: