diff --git a/pageindex/utils.py b/pageindex/utils.py
index dc7acd88..c92f6bf0 100644
--- a/pageindex/utils.py
+++ b/pageindex/utils.py
@@ -603,9 +603,11 @@ def add_node_text_with_labels(node, pdf_pages):
 
 
 async def generate_node_summary(node, model=None):
-    prompt = f"""You are given a part of a document, your task is to generate a description of the partial document about what are main points covered in the partial document.
+    prompt = f"""You are given a section of a document. Your task is to generate a description of ONLY the section titled "{node['title']}".
+    Focus only on the content that belongs to this section, not the entire page text.
 
-    Partial Document Text: {node['text']}
+    Section Title: {node['title']}
+    Page Text: {node['text']}
     
     Directly return the description, do not include any other text.
     """
diff --git a/run_pageindex.py b/run_pageindex.py
index 10702450..c5446b66 100644
--- a/run_pageindex.py
+++ b/run_pageindex.py
@@ -70,7 +70,9 @@
         # Save results
         pdf_name = os.path.splitext(os.path.basename(args.pdf_path))[0]    
         output_dir = './results'
-        output_file = f'{output_dir}/{pdf_name}_structure.json'
+        from datetime import datetime
+        current_time = datetime.now().strftime("%Y%m%d_%H%M%S")
+        output_file = f'{output_dir}/{pdf_name}_structure_{current_time}.json'
         os.makedirs(output_dir, exist_ok=True)
         
         with open(output_file, 'w', encoding='utf-8') as f: