diff --git a/data/3.0.1/Z_Object.yaml b/data/3.0.1/Z_Object.yaml
index 5453eb6..601ad40 100644
--- a/data/3.0.1/Z_Object.yaml
+++ b/data/3.0.1/Z_Object.yaml
@@ -3,7 +3,11 @@ Z Object:
   description: |
     Test description with a [link](http://apihandyman.io) and another [one](#openapi/).
   fields:
-    - name: test
+    - name: required
       type: string
+      required: true
       description: |
-        Test properties with a [link](http://apihandyman.io) and another [one](#openapi/)
\ No newline at end of file
+        Test properties with a [link](http://apihandyman.io) and another [one](#openapi/)
+    - name: notRequired
+      type: string
+      description: Non required property
\ No newline at end of file
diff --git a/web/static/css/tree.css b/web/static/css/tree.css
index 352e6bb..9d1ee80 100644
--- a/web/static/css/tree.css
+++ b/web/static/css/tree.css
@@ -73,3 +73,7 @@ div.tooltip {
     margin-bottom: 20px;
     padding-left: 0px;
 }
+
+.node .nodeRequired {
+  fill:red;
+}
\ No newline at end of file
diff --git a/web/static/js/drawTree.js b/web/static/js/drawTree.js
index d8bb2bb..ae705b8 100644
--- a/web/static/js/drawTree.js
+++ b/web/static/js/drawTree.js
@@ -1,6 +1,19 @@
 'use strict';
 var template = OpenAPISpecificationVisualDocumentation.tooltip;
 
+function getNodeTextClass(node) {
+    console.log('getNodeTextClass')
+    var result;
+    if(node.required) {
+        result = 'nodeRequired';
+    }
+    else {
+        result = 'nodeText';
+    }
+    console.log(node.name + ',' + node.required +':'+result);
+    return result;
+}
+
 function getStrokeColor(node) {
   var color;
   if (node.isTechnical) {
@@ -372,7 +385,7 @@ function drawTree(treeData){
                 return d.children || d.closedChildren ? -10 : 10;
             })
             .attr('dy', '.35em')
-            .attr('class', 'nodeText')
+            .attr('class', function(d){return getNodeTextClass(d);})
             .attr('text-anchor', function(d) {
                 return d.children || d.closedChildren ? 'end' : 'start';
             })