Added documentation on new keyboard commands.

1 files changed, 3 insertions, 0 deletions

diff --git a/README b/README
index 4953be8..646ada0 100644
--- a/README
+++ b/README
@@ -8,6 +8,9 @@ Use
   ESC: Clear selection.
   Left-click, drag and release: Add box to selection.
   Left-click: Add points under mouse pointer to selection.
+  s: Selection will be used to define a set.
+  z: Selection will be used to define a zoom region.
+  r: Reset the display (unzoom).
 
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 PANCAKE