diff --git a/src/annotation.js b/src/annotation.js
index 08a20b6..ed78b05 100644
--- a/src/annotation.js
+++ b/src/annotation.js
@@ -1,5 +1,5 @@
 import Model from 'ampersand-model'
-import ResourceCollection from './resource-collection'
+import Resource from './resource'
 
 export default Model.extend({
   idAttribute: '@id',
@@ -16,8 +16,8 @@ export default Model.extend({
     about: 'string'
   },
 
-  collections: {
-    resource: ResourceCollection
+  children: {
+    resource: Resource
   },
 
   parse: function (response) {
diff --git a/src/canvas.js b/src/canvas.js
index 222e112..6a046bf 100644
--- a/src/canvas.js
+++ b/src/canvas.js
@@ -15,7 +15,8 @@ export default Model.extend({
     },
     label: 'string',
     height: 'number',
-    width: 'number'
+    width: 'number',
+    thumbnail: 'string'
   },
 
   collections: {
diff --git a/src/resource.js b/src/resource.js
index 378d7d0..d01f88f 100644
--- a/src/resource.js
+++ b/src/resource.js
@@ -1,5 +1,5 @@
 import Model from 'ampersand-model'
-import ServiceCollection from './service-collection'
+import Service from './service'
 
 export default Model.extend({
   idAttribute: '@id',
@@ -12,8 +12,8 @@ export default Model.extend({
     width: 'number'
   },
 
-  collections: {
-    service: ServiceCollection
+  children: {
+    service: Service
   },
 
   parse: function (response) {