diff --git a/setup/gem.sh b/setup/gem.sh
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+#!/bin/sh
+
+gem install bundler         # Bundler manages an application's dependencies
+gem install git-up          # git command to fetch and rebase all branches
+gem install github-linguist # Language Savant.
+gem install lunchy          # Friendly wrapper around launchctl
+gem install tmuxinator      # Create and manage complex tmux sessions easily.
+