diff --git a/source/core/query-optimization.txt b/source/core/query-optimization.txt
index d885915b71e..5c4f48d7db1 100644
--- a/source/core/query-optimization.txt
+++ b/source/core/query-optimization.txt
@@ -144,7 +144,7 @@ An index **cannot** cover a query if:
   a :ref:`multi-key index <index-type-multikey>` index and cannot
   support a covered query.
 
-- any of the returned indexed fields are fields in subdocuments.
+- any of the indexed fields are fields in subdocuments.
   [#index-embedded-document-fields]_ For example, consider a collection
   ``users`` with documents of the following form: