diff --git a/projects/samskivert/src/java/com/samskivert/swing/util/ButtonUtil.java b/projects/samskivert/src/java/com/samskivert/swing/util/ButtonUtil.java
index ca475c26..4b3f791e 100644
--- a/projects/samskivert/src/java/com/samskivert/swing/util/ButtonUtil.java
+++ b/projects/samskivert/src/java/com/samskivert/swing/util/ButtonUtil.java
@@ -73,6 +73,7 @@ public class ButtonUtil
             {
                 // get the current value and find out where it is in the list
                 int oldval = config.getValue(property, values[0]);
+                // if it's not even in the list, newidx will be 0
                 int newidx = (1 + IntListUtil.indexOf(values, oldval))
                     % values.length;
                 config.setValue(property, values[newidx]);