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-rw-r--r--lisp/frame.el8
1 files changed, 8 insertions, 0 deletions
diff --git a/lisp/frame.el b/lisp/frame.el
index b39891cd142..b5c936a51eb 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -1855,6 +1855,14 @@ for FRAME."
;;;; Frame/display capabilities.
+;; These functions should make the features they test explicit in
+;; their names, so that when capabilities or the corresponding Emacs
+;; features change, it will be easy to find all the tests for such
+;; capabilities by a simple text search. See more about the history
+;; and the intent of these functions in
+;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2019-04/msg00004.html
+;; or in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=35058#17.
+
(declare-function msdos-mouse-p "dosfns.c")
(defun display-mouse-p (&optional display)