diff --git a/app/models/note.js b/app/models/note.js
index e1be838..705ca20 100644
--- a/app/models/note.js
+++ b/app/models/note.js
@@ -9,6 +9,9 @@ const NoteSchema = new Schema({
   text: {
     type: String, required: [true, "can't be blank"],
   },
+  user: {
+    type: Schema.Types.ObjectId, ref: 'User',
+  },
 }, { timestamps: true });
 
 module.exports = NoteSchema;
diff --git a/app/models/user.js b/app/models/user.js
index 4f8b98b..f176304 100644
--- a/app/models/user.js
+++ b/app/models/user.js
@@ -9,8 +9,8 @@ const UserSchema = new Schema({
   lastname: {
     type: String, required: [true, "can't be blank"],
   },
-  username: {
-    type: String, lowercase: true, unique: true, required: [true, "can't be blank"], match: [/^[a-zA-Z0-9]+$/, 'is invalid'], index: true,
+  email: {
+    type: String, lowercase: true, unique: true, required: [true, "can't be blank"], index: true,
   },
   password: {
     type: String, required: [true, "can't be blank"],