diff --git a/userland/calendar-custom.el b/userland/calendar-custom.el
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+++ b/userland/calendar-custom.el
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+;;; calendar-custom.el --- Calendar customisations -*- lexical-binding: t -*-
+
+;; This file is not part of GNU Emacs
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+;; commentary
+
+;;; Code:
+
+(require 'calendar)
+
+(setq calendar-mark-holidays-flag t)
+
+(provide 'calendar-custom)
+
+;;; calendar-custom.el ends here