diff --git a/config/schema/inline_entity_form.schema.yml b/config/schema/inline_entity_form.schema.yml
index 14a88cf..5f2f6b6 100644
--- a/config/schema/inline_entity_form.schema.yml
+++ b/config/schema/inline_entity_form.schema.yml
@@ -13,6 +13,15 @@ field.widget.settings.inline_entity_form_simple:
     label_plural:
       type: string
       label: "Label (plural)"
+    allow_new:
+      type: boolean
+      label: "Allow new"
+    allow_existing:
+      type: boolean
+      label: "Allow existing"
+    match_operator:
+      type: string
+      label: "Match operator"
 
 field.widget.settings.inline_entity_form_multiple:
   type: mapping