diff --git a/public/javascripts/note_tree.js b/public/javascripts/note_tree.js
index 4af51b8ba..691c2a36d 100644
--- a/public/javascripts/note_tree.js
+++ b/public/javascripts/note_tree.js
@@ -106,8 +106,20 @@ const noteTree = (function() {
 
             note.title = note.note_title;
 
+            note.extraClasses = "";
+
             if (note.is_protected) {
-                note.extraClasses = "protected";
+                note.extraClasses += ",protected";
+            }
+
+            if (childToParents[childNoteId].length > 1) {
+                console.log("Multiple classes!");
+
+                note.extraClasses += ",multiple-parents";
+            }
+
+            if (note.extraClasses.startsWith(",")) {
+                note.extraClasses = note.extraClasses.substr(1);
             }
 
             note.key = counter++ + ""; // key needs to be string
diff --git a/public/stylesheets/style.css b/public/stylesheets/style.css
index 781ff41ac..b85aee671 100644
--- a/public/stylesheets/style.css
+++ b/public/stylesheets/style.css
@@ -73,6 +73,10 @@ span.fancytree-node.protected.fancytree-folder > span.fancytree-icon {
     background-image: url("../images/icons/folder-shaded.png");
 }
 
+span.fancytree-node.multiple-parents .fancytree-title {
+    text-decoration: underline dashed;
+}
+
 .ui-autocomplete {
     max-height: 300px;
     overflow-y: auto;