Formatting.

h2/src/main/org/h2/index/IndexCursor.java

@@ -182,7 +182,9 @@ public class IndexCursor implements Cursor {
         if (row == null) {
             row = table.getTemplateRow();
         } else if (row.getValue(columnId) != null) {
-            // the union of the two envelopes
+            // if an object needs to overlap with both a and b,
+            // then it needs to overlap with the the union of a and b
+            // (not the intersection)
             ValueGeometry vg = (ValueGeometry) row.getValue(columnId).convertTo(Value.GEOMETRY);
             v = ((ValueGeometry) v.convertTo(Value.GEOMETRY)).getEnvelopeUnion(vg);
         }