--- a/Interval.st	Thu Jun 25 18:31:31 2015 +0200
+++ b/Interval.st	Thu Jun 25 18:34:04 2015 +0200
@@ -48,6 +48,10 @@
     For example, the interval (1 to:5) containes the elements (1 2 3 4 5) and
     (1 to:6 by:2) contains (1 3 5).
 
+    The step may be negative, to count backward:
+    (5 to:1 by:-1) contains (5 4 3 2 1), and (6 to:1 by:-2) contains (6 4 2).
+
+
     examples:
 
         (1 to:10) do:[:i | Transcript showCR:i]