ohmyzsh/plugins/git-extras/README.md

git-extras

This plugin provides completion definitions for some of the commands defined by git-extras, which must already be installed.

To use it, add git-extras to the plugins array in your zshrc file:

plugins=(... git-extras)

Setup notes

The completions work by augmenting the _git completion provided by zsh. This only works with the zsh-provided _git, not the _git provided by git itself. If you have both zsh and git installed, you need to make sure that the zsh-provided _git takes precedence.

OS X Homebrew Setup

NOTE: this no longer works on current Homebrew distributions of git. On OS X with Homebrew, you need to install git with brew install git --without-completions. Otherwise, git's _git will take precedence, and you won't see the completions for git-extras commands.