JAL-2759 comment

diff --git a/src/jalview/datamodel/HiddenColumns.java b/src/jalview/datamodel/HiddenColumns.java
index dfa0890..6c08cdc 100644 (file)
--- a/src/jalview/datamodel/HiddenColumns.java
+++ b/src/jalview/datamodel/HiddenColumns.java
@@ -75,7 +75,8 @@ public class HiddenColumns
   private HiddenColumnsCursor cursor = new HiddenColumnsCursor();
 
   /*
-   * cache of the number of hidden columns
+   * cache of the number of hidden columns: must be kept up to date by methods 
+   * which add or remove hidden columns
    */
   private int numColumns = 0;