diff --git a/src/main/java/com/nfl/dm/shield/dynamic/domain/instance/OrderBy.java b/src/main/java/com/nfl/dm/shield/dynamic/domain/instance/OrderBy.java
index b786573..045a7e7 100644
--- a/src/main/java/com/nfl/dm/shield/dynamic/domain/instance/OrderBy.java
+++ b/src/main/java/com/nfl/dm/shield/dynamic/domain/instance/OrderBy.java
@@ -24,6 +24,8 @@ public enum OrderBy {
 
     /**
      * Returns the comparator for the field (for in-memory sorting of the result set).
+     *
+     * @return a comparator by updateDate: nulls first, then earliest update dates, and eventually most recent update dates
      */
     public Comparator<SchemaInstance> getComparator() {
         return comparator;