diff --git a/01.preface.ipynb b/01.preface.ipynb
index bb68ce2cc..1e4362629 100644
--- a/01.preface.ipynb
+++ b/01.preface.ipynb
@@ -10,7 +10,7 @@
     }
    },
    "source": [
-    "# 前言"
+    "# 前言1"
    ]
   },
   {