:group 'notmuch)
(defcustom notmuch-search-oldest-first t
- "Show the oldest mail first when searching."
+ "Show the oldest mail first when searching.
+
+This variable defines the default sort order for displaying
+search results. Note that any filtered searches created by
+`notmuch-search-filter' retain the search order of the parent
+search."
:type 'boolean
:group 'notmuch-search)