diff --git a/core/config/schema/core.entity.schema.yml b/core/config/schema/core.entity.schema.yml
index aab3c1a..3a0fe8e 100644
--- a/core/config/schema/core.entity.schema.yml
+++ b/core/config/schema/core.entity.schema.yml
@@ -192,6 +192,9 @@ field.widget.settings.email_default:
     placeholder:
       type: label
       label: 'Placeholder'
+    size:
+      type: integer
+      label: 'Size of email field'
 
 field.widget.settings.datetime_timestamp:
   type: mapping