+If you've installed Notmuch from a [git
+checkout](https://git.notmuchmail.org/git/notmuch) or a [source
+release](https://notmuchmail.org/releases/), Notmuch Emacs is included by
+default.
+
+It is **not** recommended to install Notmuch Emacs from the Emacs Lisp Package
+Archive (ELPA), as the version there is likely not in sync with the command line
+interface.
+
+## Setup
+
+First, you need to tell Emacs about Notmuch. Add this to your `.emacs` rc file: