Specify alternative location for Brewfile doesn't work

[Konafets]

I tried the following variations:

$ brew file -f ~/.dotfiles/Brewfile install
$ brew file --file=~/.dotfiles/Brewfile install
$ brew file --file="~/.dotfiles/Brewfile" install
$ brew file install -f~/.dotfiles/Brewfile
$ brew file install --file"~/.dotfiles/Brewfile"
$ brew file install --file="~/.dotfiles/Brewfile"

I created a symlink from ~/.dotfiles/Brewfile to /usr/local/Library/Brewfile

All I get is

WARNING: Input file $brewfile is not found.
WARNING: Do you want to initialize from installed packages? [y/n]:

[rcmdnk]

I found a bug in case which Brewfile doesn't exist.
On the other hand, I could manage to use such ~/.dotfiles/Brewfile if I made it.

I also tried to use link:

$ ln -s /usr/local/Library/Brewfile ~/.dotfiles/Brefile
$ brew file -f ~/.dotfiles/Brewfile install

Then, it worked correctly.
Could you please try it again with the latest brew-file?
Currently, it is v2.1.5.