diff --git a/README.md b/README.md
index 15d5ca9a5..ca13f88b5 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ As an aside for those already familiar with LangChain - `add_node` actually take
 
 ```python
 def call_oracle(messages: list):
-    return model.invoke(message)
+    return model.invoke(messages)
 
 graph.add_node("oracle", call_oracle)
 ```