diff --git a/docs/extras/expression_language/cookbook/multiple_chains.ipynb b/docs/extras/expression_language/cookbook/multiple_chains.ipynb
index 7db06a85f5f..77ac6089166 100644
--- a/docs/extras/expression_language/cookbook/multiple_chains.ipynb
+++ b/docs/extras/expression_language/cookbook/multiple_chains.ipynb
@@ -95,7 +95,7 @@
     }
    ],
    "source": [
-    "question_generator.invoke({\"warm\"})"
+    "question_generator.invoke(\"warm\")"
    ]
   },
   {
@@ -116,7 +116,7 @@
     }
    ],
    "source": [
-    "prompt = question_generator.invoke({\"warm\"})\n",
+    "prompt = question_generator.invoke(\"warm\")\n",
     "model.invoke(prompt)"
    ]
   },