diff --git a/scripts/build_references.py b/scripts/build_references.py
deleted file mode 100644
index 5aad2cca..00000000
--- a/scripts/build_references.py
+++ /dev/null
@@ -1,43 +0,0 @@
-import re
-
-filepath = 'include/pocketpy/vm.h'
-
-with open(filepath, 'r', encoding='utf-8') as f:
-    lines = f.readlines()
-
-REGION_PATTERN = re.compile(r'#if PK_REGION\("(.+)"\)')
-
-current_region = None
-output = []
-
-def parse_line(line: str):
-    output.append(line)
-
-for line in lines:
-    if current_region:
-        if line.startswith('#endif'):
-            current_region = None
-            output.append('```\n\n')
-        else:
-            parse_line(line.strip(' '))
-    else:
-        m = REGION_PATTERN.match(line)
-        if m:
-            current_region = m.group(1)
-            output.append(f'### {current_region}\n')
-            output.append('```cpp\n')
-
-with open('docs/references.md', 'w', encoding='utf-8') as f:
-    f.write('''---
-label: References
-icon: code
-order: 2
----
-            
-This page contains all useful methods of `VM` class.
-
-''')
-    content = ''.join(output)
-    # replace {...} to  ; (multi-line match)
-    content = re.sub(r'\{[^}]+?\}', r';', content, flags=re.DOTALL)
-    f.write(content)
diff --git a/scripts/format.py b/scripts/format.py
index b77b18eb..8cbed3e1 100644
--- a/scripts/format.py
+++ b/scripts/format.py
@@ -10,7 +10,7 @@ def get_all_files(root: str):
                 continue
             if file.startswith('_'):
                 continue
-            if not file.endswith('.cpp') and not file.endswith('.h') and not file.endswith('.hpp'):
+            if not file.endswith('.c') and not file.endswith('.h') and not file.endswith('.hpp'):
                 continue
             yield fullpath