'when' instructions

README.md

@@ -23,13 +23,17 @@ safely run this file multiple times to update.
 Track thoughtbot/dotfiles
 -------------------------
 
+One time:
+
     git remote add thoughtbot git@github.com:thoughtbot/dotfiles.git
     git fetch thoughtbot
     git checkout -b thoughtbot thoughtbot/master
 
 Update
 ------
 
+Each time you want to update:
+
     git checkout thoughtbot
     git pull --rebase
     git checkout master