diff --git a/config.ini b/config.ini
index 51777cac1..5b93e339b 100644
--- a/config.ini
+++ b/config.ini
@@ -93,7 +93,7 @@ html_logo = static/logo-with-text.png
 [pdf]
 
 # The file used to post-process the generated tex file.
-# post_latex = ./static/post_latex/main.py
+post_latex = ./static/post_latex/main.py
 
 latex_logo = static/logo.png
 
diff --git a/static/post_latex/main.py b/static/post_latex/main.py
new file mode 100644
index 000000000..61cbdfab0
--- /dev/null
+++ b/static/post_latex/main.py
@@ -0,0 +1,114 @@
+import os
+import re
+import regex
+import sys
+
+def _unnumber_chaps_and_secs(lines):
+    def _startswith_unnumbered(l):
+        UNNUMBERED = {'\\section{Summary',
+                      '\\section{Exercise',
+                      '\\section{Exercises',
+                      '\\section{Discussions',
+                      '\\subsection{Summary',
+                      '\\subsection{Exercise',
+                      '\\subsection{Exercises',
+                      '\\subsection{Discussions'}
+        for unnum in UNNUMBERED:
+            if l.startswith(unnum):
+                return True
+        return False
+
+    # Preface, Installation, and Notation are unnumbered chapters
+    NUM_UNNUMBERED_CHAPS = 3
+    # Prelimilaries
+    TOC2_START_CHAP_NO = 5
+
+    preface_reached = False
+    ch2_reached = False
+    num_chaps = 0
+    for i, l in enumerate(lines):
+        if l.startswith('\\chapter{'):
+            num_chaps += 1
+            # Unnumber unnumbered chapters
+            if num_chaps <= NUM_UNNUMBERED_CHAPS:
+                chap_name = re.split('{|}', l)[1]
+                lines[i] = ('\\chapter*{' + chap_name
+                            + '}\\addcontentsline{toc}{chapter}{'
+                            + chap_name + '}\n')
+            # Set tocdepth to 2 after Chap 1
+            elif num_chaps == TOC2_START_CHAP_NO:
+                lines[i] = ('\\addtocontents{toc}{\\protect\\setcounter{tocdepth}{2}}\n'
+                            + lines[i])
+        # Unnumber all sections in unnumbered chapters
+        elif 1 <= num_chaps <= NUM_UNNUMBERED_CHAPS:
+            if (l.startswith('\\section') or l.startswith('\\subsection')
+                    or l.startswith('\\subsubsection')):
+                lines[i] = l.replace('section{', 'section*{')
+        # Unnumber summary, references, exercises, qr code in numbered chapters
+        elif _startswith_unnumbered(l):
+            lines[i] = l.replace('section{', 'section*{')
+    # Since we inserted '\n' in some lines[i], re-build the list
+    lines = '\n'.join(lines).split('\n')
+
+
+# If label is of chap*/index.md title, its numref is Chapter X instead of Section X
+def _sec_to_chap(lines):
+    for i, l in enumerate(lines):
+        # e.g., {Section \ref{\detokenize{chapter_dlc/index:chap-dlc}}} matches
+        # {Section \ref{\detokenize{chapter_prelim/nd:sec-nd}}} does not match
+        # Note that there can be multiple {Section } in one line
+
+        longest_balanced_braces = regex.findall('\{(?>[^{}]|(?R))*\}', l)
+        for src in longest_balanced_braces:
+            if src.startswith('{Section \\ref') and 'index:' in src:
+                tgt = src.replace('Section \\ref', 'Chapter \\ref')
+                lines[i] = lines[i].replace(src, tgt)
+
+
+# Remove date
+def _edit_titlepage(pdf_dir):
+    smanual = os.path.join(pdf_dir, 'sphinxmanual.cls')
+    with open(smanual, 'r') as f:
+        lines = f.read().split('\n')
+
+    for i, l in enumerate(lines):
+        lines[i] = lines[i].replace('\\@date', '')
+
+    with open(smanual, 'w') as f:
+        f.write('\n'.join(lines))
+
+
+def delete_lines(lines, deletes):
+    return [line for i, line in enumerate(lines) if i not in deletes]
+
+
+def _delete_discussions_title(lines):
+    deletes = []
+    to_delete = False
+    for i, l in enumerate(lines):
+        if 'section*{Discussion' in l or 'section{Discussion' in l:
+            to_delete = True
+        elif to_delete and '\\sphinxincludegraphics' in l:
+            to_delete = False
+        if to_delete:
+            deletes.append(i)
+    return delete_lines(lines, deletes)
+
+
+def main():
+    tex_file = sys.argv[1]
+    with open(tex_file, 'r') as f:
+        lines = f.read().split('\n')
+
+    _unnumber_chaps_and_secs(lines)
+    _sec_to_chap(lines)
+    lines = _delete_discussions_title(lines)
+
+    with open(tex_file, 'w') as f:
+        f.write('\n'.join(lines))
+
+    pdf_dir = os.path.dirname(tex_file)
+    #_edit_titlepage(pdf_dir)
+
+if __name__ == "__main__":
+    main()