diff --git a/modelcenter/PP-HelixFold/introduction_en.ipynb b/modelcenter/PP-HelixFold/introduction_en.ipynb
index 6569489ffcbfc96b6d52a247a8fabfa24cd04591..450548c825fe223649e841f9499d7d616eee5ea0 100644
--- a/modelcenter/PP-HelixFold/introduction_en.ipynb
+++ b/modelcenter/PP-HelixFold/introduction_en.ipynb
@@ -39,7 +39,7 @@
     "- nccl: 2.12.12\n",
     "\n",
     "\n",
-    "## 4. How to Use the Model\n",
+    "## 5. How to Use the Model\n",
     "\n",
     "### Installation\n",
     "\n",
@@ -167,7 +167,7 @@
     "Note that such demo for T1026 and T1037 can work without downloading large MSA datasets, only model parameters are required.\n",
     "\n",
     "\n",
-    "## 5. Related papers and citations\n",
+    "## 6. Related papers and citations\n",
     "\n",
     "If you use the code or data in this repos, please cite:\n",
     "\n",