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diff --git a/lisp/mail/binhex.el b/lisp/mail/binhex.el
index ad6ce19a958..93dd8697bd7 100644
--- a/lisp/mail/binhex.el
+++ b/lisp/mail/binhex.el
@@ -23,9 +23,13 @@
;;; Commentary:
;; BinHex is a binary-to-text encoding scheme similar to uuencode.
+;; It was used on the classic Mac OS, last released in 2001.
+;;
;; The command `binhex-decode-region' decodes BinHex-encoded text, via
;; the external program "hexbin" if that is available, or an Emacs
;; Lisp implementation if not.
+;;
+;; See also: https://en.wikipedia.org/wiki/BinHex
;;; Code: