scratch/etags-regen 146b0e7: Add a clarification

[Dmitry Gutov]

branch: scratch/etags-regen
commit 146b0e7bad3905f59c6e4beccbd6f8f4f18eeb53
Author: Dmitry Gutov <dgutov@yandex.ru>
Commit: Dmitry Gutov <dgutov@yandex.ru>

    Add a clarification
---
 lisp/progmodes/etags-regen.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/progmodes/etags-regen.el b/lisp/progmodes/etags-regen.el
index fe183bf..c22ead8 100644
--- a/lisp/progmodes/etags-regen.el
+++ b/lisp/progmodes/etags-regen.el
@@ -53,7 +53,9 @@
 Each language should be one of the recognized by etags, see
 'etags --help'.  Each tag regexp should be a string in the format
 as documented for the '--regex' arguments, except for
-the (optional) language prefix."
+the (optional) language prefix.
+
+We support only Emacs's etags program with this option."
   :type '(repeat
           (cons
            :tag "Languages group"