diff --git a/config.org b/config.org
index 845aad1..de341ed 100644
--- a/config.org
+++ b/config.org
@@ -813,6 +813,12 @@ Set up habit display.
   (setq org-habit-show-all-today t)
 #+END_SRC
 
+Set the calendar day headers to the same language as the agenda.
+
+#+BEGIN_SRC emacs-lisp
+  (setq calendar-day-header-array ["Sl" "Ln" "Mt" "Mr" "Yw" "Gw" "Sd"])
+#+END_SRC
+
 *** Refile
 
 #+BEGIN_SRC emacs-lisp