add ref to createIndex behavior section

kay-kim · kay-kim · commit 6b9ed5d9e85a · 2018-03-02T23:36:16.000-05:00
diff --git a/source/reference/method/db.collection.createIndex.txt b/source/reference/method/db.collection.createIndex.txt
@@ -117,6 +117,8 @@ indexes only:
 
 .. include:: /includes/apiargs/method-db.collection.createIndex-options-geohaystack.rst
 
+.. _create-index-behaviors:
+
 Behaviors
 ---------
 
