diff --git a/pageindex/config.yaml b/pageindex/config.yaml
index e1d4666..6b57144 100644
--- a/pageindex/config.yaml
+++ b/pageindex/config.yaml
@@ -1,7 +1,7 @@
-model: gpt-4o-2024-11-20
+model: "gpt-4o-2024-11-20"
 toc_check_page_num: 20
 max_page_num_each_node: 10
 max_token_num_each_node: 20000
-if_add_node_id: yes
-if_add_node_summary: no
-if_add_doc_description: yes
\ No newline at end of file
+if_add_node_id: "yes"
+if_add_node_summary: "no"
+if_add_doc_description: "yes"
\ No newline at end of file
diff --git a/pageindex/page_index.py b/pageindex/page_index.py
index 8c44268..e3e6330 100644
--- a/pageindex/page_index.py
+++ b/pageindex/page_index.py
@@ -1033,7 +1033,7 @@ def page_index_main(doc, opt=None):
 
 
 def page_index(doc, model=None, toc_check_page_num=None, max_page_num_each_node=None, max_token_num_each_node=None,
-               f_add_node_id=None, if_add_node_summary=None, if_add_doc_description=None):
+               if_add_node_id=None, if_add_node_summary=None, if_add_doc_description=None):
     
     user_opt = {
         arg: value for arg, value in locals().items()