What is the meaning of :/ (colon, forward slash) in the 2.0 version of git add --update syntax?

Question

I upgraded Git a couple months ago and since then I\'ve been receiving the following deprecation notice upon attempting git add --update:

Answer 1

The first answer is not completely correct. In the context of git-add, the :/ cannot be a revision. It is a pathspec. See my answer to the related question "What does "git add -A :/" do?".

pathspec is defined in gitglossary(7).