Index: .dir-locals.el
==================================================================
--- .dir-locals.el
+++ .dir-locals.el
@@ -1,6 +1,8 @@
 ;;; Directory Local Variables
 ;;; For more information see (info "(emacs) Directory Variables")
 
 ((emacs-lisp-mode
-  (tab-width . 4)
-  (indent-tabs-mode . nil)))
+  (indent-tabs-mode . nil)
+  (show-trailing-whitespace . t)
+  (sentence-end-double-space . t)
+  (byte-compile-error-on-warn . t)))