diff --git a/templates/sig/prism/node.rbs.erb b/templates/sig/prism/node.rbs.erb
index 635f352e8aa..3064bd7eacc 100644
--- a/templates/sig/prism/node.rbs.erb
+++ b/templates/sig/prism/node.rbs.erb
@@ -20,6 +20,7 @@ module Prism
     def to_dot: () -> String
     def tunnel: (Integer line, Integer column) -> Array[Prism::node]
     def deprecated: (*String) -> void
+    def newline!: (Array[untyped]) -> void
   end
 
   type node_singleton = singleton(Node) & _NodeSingleton