diff --git a/source/use-cases/product-catalog.txt b/source/use-cases/product-catalog.txt
index d4d8f5b4bcd..40375fa90d5 100644
--- a/source/use-cases/product-catalog.txt
+++ b/source/use-cases/product-catalog.txt
@@ -478,7 +478,7 @@ key is difficult to predict without information about your database's
 actual activity and distribution. Consider that:
 
 - ``details.issue_date`` would be a poor addition to the shard key
-  because, although it appears in a number of queries, no query was
+  because, although it appears in a number of queries, no queries were
   were *selective* by this field.
 
 - you should include one or more fields in the ``detail`` document