-`notmuch-address-locate-command`,
-`notmuch-documentation-first-line`, `notmuch-folder`,
-`notmuch-hello-trim', `notmuch-hello-versions` => `notmuch-version`,
-`notmuch-remove-if-not`, `notmuch-search-disjunctive-regexp`,
-`notmuch-sexp-eof`, `notmuch-split-content-type`, and
-`notmuch-tree-button-activate`.
+
+ notmuch-address-locate-command,
+ notmuch-documentation-first-line, notmuch-folder,
+ notmuch-hello-trim, notmuch-hello-versions => notmuch-version,
+ notmuch-remove-if-not, notmuch-search-disjunctive-regexp,
+ notmuch-sexp-eof, notmuch-split-content-type, and
+ notmuch-tree-button-activate.
+
+Keymaps are no longer fset, which means they need to be referred to in
+define-key directly (without quotes). If your Emacs configuration has a
+keybinding like:
+
+ (define-key 'notmuch-show-mode-map "7" 'foo)
+
+you should change it to:
+
+ (define-key notmuch-show-mode-map "7" 'foo)