diff --git a/docs/advanced_features/separate_reasoning.ipynb b/docs/advanced_features/separate_reasoning.ipynb
index 83124cf49..14e97ad73 100644
--- a/docs/advanced_features/separate_reasoning.ipynb
+++ b/docs/advanced_features/separate_reasoning.ipynb
@@ -196,7 +196,7 @@
     "    if chunk.choices[0].delta.content:\n",
     "        content += chunk.choices[0].delta.content\n",
     "    if chunk.choices[0].delta.reasoning_content:\n",
-    "        reasoning_content = chunk.choices[0].delta.reasoning_content\n",
+    "        reasoning_content += chunk.choices[0].delta.reasoning_content\n",
     "\n",
     "print_highlight(\"==== Reasoning ====\")\n",
     "print_highlight(reasoning_content)\n",