diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52209a306..eb40d8781 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 * **Build 11x** (2014-07-xx)
   - Added new Backend control for creating informative panels (hints).
   - Added new properties to RelationController: readOnly, showSorting, defaultSort.
+  - Hashable, Sluggable, Purgeable and Validation traits must now be used in the Model class definition.
 
 * **Build 116** (2014-07-07)
   - Added new layout and page method `onInit()` called after components are initialized and before AJAX requests are processed.
diff --git a/modules/backend/models/User.php b/modules/backend/models/User.php
index 2dc869d67..243c9b930 100644
--- a/modules/backend/models/User.php
+++ b/modules/backend/models/User.php
@@ -13,6 +13,8 @@ use October\Rain\Auth\Models\User as UserBase;
 class User extends UserBase
 {
     use \October\Rain\Database\Traits\Hashable;
+    use \October\Rain\Database\Traits\Purgeable;
+    use \October\Rain\Database\Traits\Validation;
 
     /**
      * @var string The database table used by the model.
diff --git a/modules/backend/models/UserGroup.php b/modules/backend/models/UserGroup.php
index 7465fbf46..5ef2e9fff 100644
--- a/modules/backend/models/UserGroup.php
+++ b/modules/backend/models/UserGroup.php
@@ -10,6 +10,8 @@ use October\Rain\Auth\Models\Group as GroupBase;
  */
 class UserGroup extends GroupBase
 {
+    use \October\Rain\Database\Traits\Validation;
+
     /**
      * @var string The database table used by the model.
      */
diff --git a/modules/system/models/MailLayout.php b/modules/system/models/MailLayout.php
index e671fde5f..9dfaf7b18 100644
--- a/modules/system/models/MailLayout.php
+++ b/modules/system/models/MailLayout.php
@@ -5,6 +5,8 @@ use System\Classes\ApplicationException;
 
 class MailLayout extends Model
 {
+    use \October\Rain\Database\Traits\Validation;
+
     /**
      * @var string The database table used by the model.
      */
diff --git a/modules/system/models/MailTemplate.php b/modules/system/models/MailTemplate.php
index 72f15a70e..064f35df5 100644
--- a/modules/system/models/MailTemplate.php
+++ b/modules/system/models/MailTemplate.php
@@ -9,6 +9,8 @@ use System\Classes\PluginManager;
 
 class MailTemplate extends Model
 {
+    use \October\Rain\Database\Traits\Validation;
+
     /**
      * @var string The database table used by the model.
      */
diff --git a/modules/system/models/PluginVersion.php b/modules/system/models/PluginVersion.php
index 2c44c26dc..49d80c46e 100644
--- a/modules/system/models/PluginVersion.php
+++ b/modules/system/models/PluginVersion.php
@@ -6,6 +6,7 @@ use System\Classes\PluginManager;
 
 class PluginVersion extends Model
 {
+    use \October\Rain\Database\Traits\Purgeable;
 
     public $table = 'system_plugin_versions';