This makes lintian stop complaining about:

W: elpa-notmuch: wrong-section-according-to-package-name elpa-notmuch => lisp
---
 debian/control | 1 +
 1 file changed, 1 insertion(+)

diff --git a/debian/control b/debian/control
index 51129886..cff610cf 100644
--- a/debian/control
+++ b/debian/control
@@ -121,6 +121,7 @@ Description: thread-based email index, search and tagging (transitional package)
 Package: elpa-notmuch
 Architecture: all
 Depends: ${misc:Depends}, ${elpa:Depends}
+Section: lisp
 Description: thread-based email index, search and tagging (emacs interface)
  Notmuch is a system for indexing, searching, reading, and tagging
  large collections of email messages in maildir or mh format. It uses
-- 
2.15.0

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