diff --git a/docs/guide/tutorial.md b/docs/guide/tutorial.md
index 86ee91d..94f37f8 100644
--- a/docs/guide/tutorial.md
+++ b/docs/guide/tutorial.md
@@ -37,10 +37,11 @@ interfaces:
     description: A tuner service to manages tuner stations
     properties:
       - name: currentStation
-        type: Station
+        type: {ref: Station}
         description: current selected station
       - name: stationList
-        type: Station[]
+        type: array
+        items: {ref: Station}
         description: list of current available stations
     operations:
       - name: nextStation
@@ -51,20 +52,19 @@ interfaces:
         description: update current station
         params:
           - name: stationId
-          - type: id
+          - type: int
 
 structs:
   - name: Station
     fields:
       - name: stationId
-        type: id
+        type: int
         description: station id
       - name: name
         type: string
         description: station name
       - name: modified
         type: string
-        format: date-time
         description: station last time modified
 
 enums:
@@ -99,17 +99,17 @@ interfaces:
   - name: WeatherStation
   - properties:
       - { name: temperature, type: float }
-      - { name: lastError, type: Error }
+      - { name: lastError, type: {ref: Error} }
   - operations:
       - { name: reset }
   - signals:
       - name: error
         params:
-          - { name: error, type: Error }
+          - { name: error, type: {ref: Error} }
 
 structs:
   - name: Error
     fields:
       - name: msg
         type: string
-```
\ No newline at end of file
+```