diff --git a/app/Model/DecayingModel.php b/app/Model/DecayingModel.php
index 6bdea5a10..5badb34e9 100644
--- a/app/Model/DecayingModel.php
+++ b/app/Model/DecayingModel.php
@@ -17,6 +17,7 @@ class DecayingModel extends AppModel
     );
 
     private $__registered_model_classes = array();
+    public $allowed_overrides = array('threshold' => 1, 'tau', 'delta');
 
     public function afterFind($results, $primary = false) {
         foreach ($results as $k => $v) {
@@ -438,9 +439,8 @@ class DecayingModel extends AppModel
 
     public function overrideModelParameters(&$model, $model_overrides)
     {
-        $allowed_overrides = array('threshold' => 1);
         foreach ($model_overrides as $parameter => $value) {
-            if (isset($allowed_overrides[$parameter])) {
+            if (isset($this->allowed_overrides[$parameter])) {
                 $model['DecayingModel']['parameters'][$parameter] = $value;
             }
         }
diff --git a/app/View/DecayingModel/decaying_tool_simulation.ctp b/app/View/DecayingModel/decaying_tool_simulation.ctp
index dcdd9acbc..dd8f6d008 100644
--- a/app/View/DecayingModel/decaying_tool_simulation.ctp
+++ b/app/View/DecayingModel/decaying_tool_simulation.ctp
@@ -31,11 +31,13 @@
 {
     "includeDecayScore": 1,
     "excludeDecayed": 0,
-    "decayingModel": <?php echo h($decaying_model['DecayingModel']['id']); ?>,
+    "decayingModel": [<?php echo h($decaying_model['DecayingModel']['id']); ?>],
     "to_ids": 1,
     "org": <?php echo h($user['Organisation']['id']);?>,
-    "tags": <?php echo json_encode($registered_taxonomies); ?>
-
+    "tags": <?php echo json_encode($registered_taxonomies); ?>,
+    "modelOverrides": {
+        
+    }
 }</textarea>
                                 </br>
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