From c05e60ecb2244c09c8584dff5f55af425dc12a1e Mon Sep 17 00:00:00 2001
From: Peter Kokot <peterkokot@gmail.com>
Date: Sat, 1 Nov 2025 21:40:06 +0100
Subject: [PATCH] GNUInstallDirs: Add more info about DATADIR

---
 Modules/GNUInstallDirs.cmake | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Modules/GNUInstallDirs.cmake b/Modules/GNUInstallDirs.cmake
index f677c27ff3..b96f32725d 100644
--- a/Modules/GNUInstallDirs.cmake
+++ b/Modules/GNUInstallDirs.cmake
@@ -94,6 +94,12 @@ where ``<dir>`` is one of:
   read-only architecture-independent data root (``share``)
 ``DATADIR``
   read-only architecture-independent data (``DATAROOTDIR``)
+
+  The ``DATADIR`` and ``DATAROOTDIR`` are treated separately so that
+  ``DATADIR`` can be customized for project-specific data files, while
+  ``DATAROOTDIR`` remains unchanged for standard architecture-independent
+  locations ``INFODIR``, ``LOCALEDIR``, ``MANDIR``, and ``DOCDIR``.
+
 ``INFODIR``
   info documentation (``DATAROOTDIR/info``)
 ``LOCALEDIR``