diff --git a/source/core/indexes-introduction.txt b/source/core/indexes-introduction.txt
index b0a946a15e7..be69013af66 100644
--- a/source/core/indexes-introduction.txt
+++ b/source/core/indexes-introduction.txt
@@ -10,7 +10,7 @@ Index Introduction
 Indexes support the efficient execution of queries in MongoDB. Without
 indexes, MongoDB must perform a *collection scan*, i.e. scan every
 document in a collection, to select those documents that match the
-query statement. If an appropriate index exists for a query,
+query statement. If an appropriate index exist for a document,
 MongoDB can use the index to limit the number of documents it must
 inspect.