diff --git a/classes/deck/deck.gd b/classes/deck/deck.gd
index 94b9e02..f7ce6fb 100644
--- a/classes/deck/deck.gd
+++ b/classes/deck/deck.gd
@@ -44,6 +44,8 @@ signal node_added(node: DeckNode)
 signal node_removed(node: DeckNode)
 ## Emitted when nodes have been disconnected
 signal nodes_disconnected(from_node_id: String, to_node_id: String, from_output_port: int, to_input_port: int)
+## Emitted when the [member variable_stack] has been modified.
+signal variables_updated()
 
 #region group signals
 signal node_added_to_group(node: DeckNode, assign_id: String, assign_to_self: bool, deck: Deck)
@@ -196,6 +198,12 @@ func remove_node(uuid: String, remove_connections: bool = false, force: bool = f
 		node_removed_from_group.emit(uuid, remove_connections, self)
 
 
+## Set a variable on this deck.
+func set_variable(var_name: String, value: Variant) -> void:
+	variable_stack[var_name] = value
+	variables_updated.emit()
+
+
 ## Group the [param nodes_to_group] into a new deck and return it.
 ## Returns [code]null[/code] on failure.[br]
 ## Adds a group node to this deck, and adds group input and output nodes in the group.
diff --git a/classes/deck/nodes/set_deck_var.gd b/classes/deck/nodes/set_deck_var.gd
index 40f383f..3bd5812 100644
--- a/classes/deck/nodes/set_deck_var.gd
+++ b/classes/deck/nodes/set_deck_var.gd
@@ -42,7 +42,8 @@ func _receive(to_input_port: int, _data: Variant, _extra_data: Array = []) -> vo
 	var var_name: String = resolve_input_port_value(0)
 	var var_value: Variant = resolve_input_port_value(1)
 
-	_belonging_to.variable_stack[var_name] = var_value
+	#_belonging_to.variable_stack[var_name] = var_value
+	_belonging_to.set_variable(var_name, var_value)
 
 	send(0, var_value)