diff --git a/src/common/org/apache/solr/common/params/CoreAdminParams.java b/src/common/org/apache/solr/common/params/CoreAdminParams.java
index 4c69eaa7205..7a319f95e8a 100644
--- a/src/common/org/apache/solr/common/params/CoreAdminParams.java
+++ b/src/common/org/apache/solr/common/params/CoreAdminParams.java
@@ -54,7 +54,7 @@ public interface CoreAdminParams
   public final static String FILE = "file";
   
   /** If you merge indexes, what are the index directories.
-   * The directories are separated by ",". */
+   * The directories are specified by multiple indexDir parameters. */
   public final static String INDEX_DIR = "indexDir";
 
   public enum CoreAdminAction {