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diff --git a/doc/parens.texi b/doc/parens.texi
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+++ b/doc/parens.texi
@@ -373,8 +373,11 @@ named @i{source}: pressing it you'll jump to the symbol's definition.
The second button, dubbed @i{manual}, will open the Scheme
implementation's manual page for the symbol at hand. For Racket, that
will open your web browser displaying the corresponding reference's page
-(using Emacs' @code{browser-url} command), while in Guile a lookup will
-be performed in the texinfo manual.
+(using the HTML browser in Racket's configuration, which you can edit in
+DrRacket's preferences dialog, or by setting
+@code{plt:framework-pref:external-browser} directly in
+@file{~/.racket/racket-prefs.rktd}), while in Guile a lookup will be
+performed in the texinfo manual.
@cindex Guile info nodes
For Guile, the manual lookup uses the info indexes in the standard