1 files changed, 7 insertions, 0 deletions

diff --git a/README b/README
index f3fe1b8..722286a 100644
--- a/README
+++ b/README
@@ -20,6 +20,13 @@ used to highlight the selection.
   Mouse-wheel: scroll to zoom in or out by 10% of the window size with
   the focus at the center of the window.
 
+An attempt was made to use the glutPassiveMotionFunc to show the
+information for the data under the mouse pointer.  This proved to be
+too slow so the use of this technique was discarded.  The basic
+selection mechanisms can be used to identify the points under the
+mouse.  Alternatively a keyboard command might be added to provide the
+information upon a keypress.
+
 ======
 COFFEE
 ======