5 files changed, 35 insertions, 0 deletions
diff --git a/lisp/language/ethio-util.el b/lisp/language/ethio-util.el
index 2f76acfe7cb..3744b7b24f9 100644
--- a/lisp/language/ethio-util.el
+++ b/lisp/language/ethio-util.el
@@ -30,6 +30,13 @@
 
 ;;; Commentary:
 
+;; Note: This file includes several codepoints outside of the Unicode
+;; 0..#x10FFFF range, which are characters that were not unified into
+;; Unicode.  Therefore, this file is encoded in utf-8-emacs, because
+;; UTF-8 cannot encode such codepoints.  We include these codepoints
+;; literally in the file to have them displayed by suitable fonts,
+;; which makes maintenance easier.
+
 ;;; Code:
 
 (require 'robin)
diff --git a/lisp/language/ethiopic.el b/lisp/language/ethiopic.el
index 1faba424ba2..fb1e2728436 100644
--- a/lisp/language/ethiopic.el
+++ b/lisp/language/ethiopic.el
@@ -27,6 +27,13 @@
 
 ;;; Commentary:
 
+;; Note: This file includes several codepoints outside of the Unicode
+;; 0..#x10FFFF range, which are characters that were not unified into
+;; Unicode.  Therefore, this file is encoded in utf-8-emacs, because
+;; UTF-8 cannot encode such codepoints.  We include these codepoints
+;; literally in the file to have them displayed by suitable fonts,
+;; which makes maintenance easier.
+
 ;;; Code:
 
 (define-ccl-program ccl-encode-ethio-font
diff --git a/lisp/language/ind-util.el b/lisp/language/ind-util.el
index e2a21820f4f..447ca0c20cc 100644
--- a/lisp/language/ind-util.el
+++ b/lisp/language/ind-util.el
@@ -27,6 +27,13 @@
 ;; Finally, this program provides the compatibility support with
 ;; old implementation of Devanagari script.
 
+;; Note: This file includes several codepoints outside of the Unicode
+;; 0..#x10FFFF range, which are characters that were not unified into
+;; Unicode.  Therefore, this file is encoded in utf-8-emacs, because
+;; UTF-8 cannot encode such codepoints.  We include these codepoints
+;; literally in the file to have them displayed by suitable fonts,
+;; which makes maintenance easier.
+
 ;;; Code:
 
 ;;; Transliteration
diff --git a/lisp/language/tibet-util.el b/lisp/language/tibet-util.el
index e7cb289b65f..0f09c48d6d6 100644
--- a/lisp/language/tibet-util.el
+++ b/lisp/language/tibet-util.el
@@ -32,6 +32,13 @@
 
 ;;; Commentary:
 
+;; Note: This file includes several codepoints outside of the Unicode
+;; 0..#x10FFFF range, which are characters that were not unified into
+;; Unicode.  Therefore, this file is encoded in utf-8-emacs, because
+;; UTF-8 cannot encode such codepoints.  We include these codepoints
+;; literally in the file to have them displayed by suitable fonts,
+;; which makes maintenance easier.
+
 ;;; Code:
 
 (defconst tibetan-obsolete-glyphs
diff --git a/lisp/language/tibetan.el b/lisp/language/tibetan.el
index 0262798bb27..81210457897 100644
--- a/lisp/language/tibetan.el
+++ b/lisp/language/tibetan.el
@@ -34,6 +34,13 @@
 
 ;;; Commentary:
 
+;; Note: This file includes several codepoints outside of the Unicode
+;; 0..#x10FFFF range, which are characters that were not unified into
+;; Unicode.  Therefore, this file is encoded in utf-8-emacs, because
+;; UTF-8 cannot encode such codepoints.  We include these codepoints
+;; literally in the file to have them displayed by suitable fonts,
+;; which makes maintenance easier.
+
 ;;; Code:
 
 ;;; Tibetan Character set.