diff --git a/Scripts/NodeGraph.cs b/Scripts/NodeGraph.cs
index 6b95fc2..38d0364 100644
--- a/Scripts/NodeGraph.cs
+++ b/Scripts/NodeGraph.cs
@@ -11,7 +11,7 @@ namespace XNode {
         /// See: <see cref="AddNode{T}"/> </summary>
         [SerializeField] public List<Node> nodes = new List<Node>();
 
-        /// <summary> Add a node to the graph by type </summary>
+        /// <summary> Add a node to the graph by type (convenience method - will call the System.Type version) </summary>
         public T AddNode<T>() where T : Node {
             return AddNode(typeof(T)) as T;
         }
@@ -37,14 +37,14 @@ namespace XNode {
 
         /// <summary> Safely remove a node and all its connections </summary>
         /// <param name="node"> The node to remove </param>
-        public void RemoveNode(Node node) {
+        public virtual void RemoveNode(Node node) {
             node.ClearConnections();
             nodes.Remove(node);
             if (Application.isPlaying) Destroy(node);
         }
 
         /// <summary> Remove all nodes and connections from the graph </summary>
-        public void Clear() {
+        public virtual void Clear() {
             if (Application.isPlaying) {
                 for (int i = 0; i < nodes.Count; i++) {
                     Destroy(nodes[i]);
@@ -54,7 +54,7 @@ namespace XNode {
         }
 
         /// <summary> Create a new deep copy of this graph </summary>
-        public XNode.NodeGraph Copy() {
+        public virtual XNode.NodeGraph Copy() {
             // Instantiate a new nodegraph instance
             NodeGraph graph = Instantiate(this);
             // Instantiate all nodes inside the graph