Tried the following command:
git commit path/to/my/file.ext -m \'my notes\'
Receive an error in git version 1.5.2.1:
error:
For git 1.9.5 on Windows 7: "my Notes" (double quotes) corrected this issue. In my case putting the file(s) before or after the -m 'message'. made no difference; using single quotes was the problem.