diff --git a/docs/cli.md b/docs/cli.md
index 8638e3c82..ec92144bb 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -240,9 +240,8 @@ module.exports = {
       );
       await queryInterface.addIndex(
         'Person',
-        'petName',
+        ['petName'],
         {
-          fields: 'petName',
           unique: true,
           transaction,
         }
diff --git a/versioned_docs/version-6.x.x/other-topics/migrations.md b/versioned_docs/version-6.x.x/other-topics/migrations.md
index f5163d53a..00ee6d744 100644
--- a/versioned_docs/version-6.x.x/other-topics/migrations.md
+++ b/versioned_docs/version-6.x.x/other-topics/migrations.md
@@ -306,9 +306,8 @@ module.exports = {
       );
       await queryInterface.addIndex(
         'Person',
-        'petName',
+        ['petName'],
         {
-          fields: 'petName',
           unique: true,
           transaction,
         }