diff --git a/indexer/src/main/java/com/metamx/druid/indexer/DeterminePartitionsJob.java b/indexer/src/main/java/com/metamx/druid/indexer/DeterminePartitionsJob.java
index 4b4a5c8b995..d4ee1941396 100644
--- a/indexer/src/main/java/com/metamx/druid/indexer/DeterminePartitionsJob.java
+++ b/indexer/src/main/java/com/metamx/druid/indexer/DeterminePartitionsJob.java
@@ -79,13 +79,16 @@ import java.util.Set;
 
 /**
  * Determines appropriate ShardSpecs for a job by determining whether or not partitioning is necessary, and if so,
- * choosing the highest cardinality dimension that satisfies the criteria:
+ * choosing the best dimension that satisfies the criteria:
  *
  * <ul>
  *   <li>Must have exactly one value per row.</li>
  *   <li>Must not generate oversized partitions. A dimension with N rows having the same value will necessarily
  *   put all those rows in the same partition, and that partition may be much larger than the target size.</li>
  * </ul>
+ *
+ * "Best" means a very high cardinality dimension, or, if none exist, the dimension that minimizes segment size
+ * variance.
  */
 public class DeterminePartitionsJob implements Jobby
 {