diff --git a/scripts/merge_by_toc.py b/scripts/merge_by_toc.py
index f74e39e..f9e8424 100644
--- a/scripts/merge_by_toc.py
+++ b/scripts/merge_by_toc.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # coding: utf8
 #
-# Generate all-in-one Markdown file for ``dev-guide``
+# Generate all-in-one Markdown file for ``doc-cn``
 # Tip: 不支持中文文件名
 # readme.md 中的目录引用的md多次（或者md的sub heading)，以第一次出现为主
 # 每个版本都会生成一个自己的 PDF
@@ -33,13 +33,8 @@
     level = 0
     current_level = ""
     for line in fp:
-        if not in_toc and line.startswith("## "):
+        if not in_toc and not line.startswith("<!-- "):
             in_toc = True
-        elif in_toc and line.startswith('## '):
-            in_toc = False
-            # yes, toc processing done
-            # contents.append(line[1:]) # skip 1 level TOC
-            break
         elif in_toc and not line.startswith('#') and line.strip():
             ## get level from space length
             level_space_str = level_pattern.findall(line)[0][:-1]
@@ -66,9 +61,6 @@
         else:
             pass
 
-    # overview part in README.md
-    followups.insert(1, ("RAW", 0, fp.read()))
-
 # stage 2, get file heading
 file_link_name = {}
 title_pattern = re.compile(r'(^#+)\s.*')
@@ -98,7 +90,9 @@ def replace_link(match):
         link_name = match.group(1)
         link = match.group(2)
         frag = match.group(3)
-        if link.endswith('.md') or '.md#' in link:
+        if link.startswith('http'):
+            return full
+        elif link.endswith('.md') or '.md#' in link:
             if not frag:
                 relative_path = ''
                 if not link.startswith('.'):
@@ -132,6 +126,7 @@ def replace_heading(match):
 def remove_copyable(match):
     return ''
 
+
 # stage 3, concat files
 for type_, level, name in followups:
     if type_ == 'TOC':