(Special Properties): Add index entry and xref for tooltips.

1 files changed, 3 insertions, 1 deletions

diff --git a/lispref/text.texi b/lispref/text.texi
index 5d8809b215d..d5760a73d89 100644
--- a/lispref/text.texi
+++ b/lispref/text.texi
@@ -2678,10 +2678,12 @@ or shorter, higher or lower, wider or narrow, or replaced with an image.
 
 @item help-echo
 @kindex help-echo @r{(text property)}
+@cindex tooltip
 @anchor{Text help-echo}
 If text has a string as its @code{help-echo} property, then when you
 move the mouse onto that text, Emacs displays that string in the echo
-area, or in the tooltip window.
+area, or in the tooltip window (@pxref{Tooltips,,, emacs, The GNU Emacs
+Manual}).
 
 If the value of the @code{help-echo} property is a function, that
 function is called with three arguments, @var{window}, @var{object} and