Suggestion for 'git add' CLI

hi there, I have a suggestion about git CLI.when I use 'git add -A' or 
'git add --all' it stages all of my files but when I use git add 
<file_name> it adds the file name to the stage, not all files. but when 
I use ' git add <file_name> --all ' it also works and adds all the files 
to the stage. I think it's better to provide a warning for this 
situation. thank you.