diff --git a/README.md b/README.md
index e8dfe35..ac54a51 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,20 @@ be in a dirty state, permanently.
 
 ## Usage
 
-First clone the repo. Then run `./boostrap.sh`, this will create all the
-necessary symlinks. This is a **destructive** process, so backup your dotfiles
-first.
+First clone the repo.
+
+As mentioned above my git credentials are stored in an untracked file:
+`$HOME/.extra`. This must be manually created, mine looks like:
+
+```
+# Git credentials
+GIT_AUTHOR_NAME="Jonny Barnes"
+GIT_COMMITER_NAME="$GIT_AUTHOR_NAME"
+git config --global user.name "$GIT_AUTHOR_NAME"
+GIT_AUTHOR_EMAIL="jonny@jonnybarnes.uk"
+GIT_COMMITER_EMAIL="$GIT_AUTHOR_EMAIL"
+git config --global user.email "$GIT_AUTHOR_EMAIL"
+```
+
+Run `./boostrap.sh`, this will create all the necessary symlinks, then source
+`.zshrc`. This is a **destructive** process, so backup your dotfiles first.