diff --git a/lib/ecto/migration.ex b/lib/ecto/migration.ex
index 242fea58..6c3bb7a3 100644
--- a/lib/ecto/migration.ex
+++ b/lib/ecto/migration.ex
@@ -921,7 +921,7 @@ defmodule Ecto.Migration do
       create index("products", ["(to_tsvector('english', name))"],
                    name: :products_name_vector, using: "GIN")
 
-  If the expression is a column name it will not be quoted. This may cause issues
+  If the expression is a column name, it will not be quoted. This may cause issues
   when the column is named after a reserved word. Consider using an atom instead.
   """
   def index(table, columns, opts \\ [])