Why doesn't git commit -a add new files?

Question

I\'m a bit new to git, and I fail to understand why git commit -a only stages changed and deleted files but not new files.

Can anyone explain why is it

Answer 1

For Future sake you can stick with this solution from Ian Clelland,

git add -A && git commit -m "Your Message"

Since it won't be too visible from comment https://stackoverflow.com/a/2419270/5836034