JAL-1551 JAL-2106 javadoc

diff --git a/src/jalview/api/DBRefEntryI.java b/src/jalview/api/DBRefEntryI.java
index 01b1d2c..2ce7e4a 100644 (file)
--- a/src/jalview/api/DBRefEntryI.java
+++ b/src/jalview/api/DBRefEntryI.java
@@ -73,6 +73,12 @@ public interface DBRefEntryI
    */
   public int getEndRes();
 
+  /**
+   * access a mapping, if present that can be used to map positions from the
+   * associated dataset sequence to the DBRef's sequence frame.
+   * 
+   * @return null or a valid mapping.
+   */
   public Mapping getMap();
 
   /**