find [-H | -L | -P] [-EXdsx] [-f path] path ... [expression]
find [-H | -L | -P] [-EXdsx] -f path [path ...] [expression]
There is a `[-f path]` and `-f path` but it is explained anywhere. (There is one sentence that mentions it in the BUGS section, but it does not really explain or say what it does.)
(It must not be used a lot as it was originally not documented either in the CSRG import from way back when.)
For the record, `-f path` is the same as specifying `path` as one of the starting points, but it won't conflict with other options. So you can write `-f -print` to search a directory called `-print`, or `-f \(` if the name is an open paren, etc.