diff --git a/Startup-app/backend/models/idea.js b/Startup-app/backend/models/idea.js
index 48919d97213c7b6c8843c629077d426e0f80cca6..83da5ac2b7c11c2542261a1baf28d966f08bca29 100644
--- a/Startup-app/backend/models/idea.js
+++ b/Startup-app/backend/models/idea.js
@@ -25,6 +25,13 @@ const IdeaSchema = new mongoose.Schema({
         ref: 'User',
         default: [],
     }],
+    // List of collaborators
+    collaborators: [{
+        type: mongoose.Schema.Types.ObjectId,
+        ref: 'User',
+        default: [],
+    }],
+
 }, { timestamps: true });
 
 const Idea = mongoose.models.Idea || mongoose.model('Idea', IdeaSchema);