diff --git a/makesite.py b/makesite.py
index 051d227..3a61b10 100755
--- a/makesite.py
+++ b/makesite.py
@@ -71,12 +71,12 @@ def log(msg, *args):
     sys.stderr.write(msg.format(*args) + "\n")
 
 
-def strip_tags_and_truncate(text, words=25):
+def _strip_tags_and_truncate(text, words=25):
     """Remove HTML tags and truncate text to the specified number of words."""
     return " ".join(re.sub(r"(?s)<.*?>", " ", text).split()[:words])
 
 
-def parse_headers(text):
+def _parse_headers(text):
     """Parse HTML comment headers and yield (key, value, end-index) tuples."""
     for match in re.finditer(r"\s*<!--\s*(.+?)\s*:\s*(.+?)\s*-->\s*|.+", text):
         if not match.group(1):
@@ -84,7 +84,7 @@ def parse_headers(text):
         yield match.group(1), match.group(2), match.end()
 
 
-def rfc_2822_format(date_str):
+def _rfc_2822_format(date_str):
     """Convert yyyy-mm-dd date string to RFC 2822 format date string."""
     d = datetime.datetime.strptime(date_str, "%Y-%m-%d")
     return d \
@@ -119,7 +119,7 @@ def parse_post_file(filename, params):
 
     # Read headers.
     end = 0
-    for key, val, end in parse_headers(text):
+    for key, val, end in _parse_headers(text):
         content[key] = val
 
     # slugify post title
@@ -132,20 +132,20 @@ def parse_post_file(filename, params):
     if filename.endswith((".md", ".mkd", ".mkdn", ".mdown", ".markdown")):
         summary_index = text.find("<!-- more")
         if summary_index > 0:
-            summary = markdown(strip_html_tags(text[:summary_index]))
+            summary = markdown(_strip_html_tags(text[:summary_index]))
         else:
-            summary = strip_tags_and_truncate(markdown(strip_html_tags(text)))
+            summary = _strip_tags_and_truncate(markdown(_strip_html_tags(text)))
         clean_text = text.replace("<!-- more -->", "")
         text = markdown(clean_text)
     else:
-        summary = strip_tags_and_truncate(text)
+        summary = _strip_tags_and_truncate(text)
 
     # Update the dictionary with content and RFC 2822 date.
     content.update(
         {
             "content": text,
-            "content_rss": make_links_absolute(params["site_url"], text),
-            "rfc_2822_date": rfc_2822_format(content["date"]),
+            "content_rss": _make_links_absolute(params["site_url"], text),
+            "rfc_2822_date": _rfc_2822_format(content["date"]),
             "summary": summary,
         }
     )
@@ -153,7 +153,7 @@ def parse_post_file(filename, params):
     return content
 
 
-def make_links_absolute(site_url, text):
+def _make_links_absolute(site_url, text):
     """Convert relative links to absolute URLs for RSS feed."""
     # TODO externalize links replacement configuration
     return text \
@@ -161,7 +161,7 @@ def make_links_absolute(site_url, text):
         .replace("href=\"/20", "href=\"" + site_url + "/20")
 
 
-def strip_html_tags(text):
+def _strip_html_tags(text):
     """Remove HTML tags from text."""
     while True:
         original_text = text
@@ -285,7 +285,7 @@ def _process_comments(page_params, stacosys_url, comment_layout,
     return len(comments), comments_html, comment_section_html
 
 
-def get_friendly_date(date_str):
+def _get_friendly_date(date_str):
     """Convert date string to French-formatted readable date.
 
     Args:
@@ -334,7 +334,7 @@ def _setup_page_params(content, params):
     page_params["header"] = ""
     page_params["footer"] = ""
     page_params["date_path"] = page_params["date"].replace("-", "/")
-    page_params["friendly_date"] = get_friendly_date(page_params["date"])
+    page_params["friendly_date"] = _get_friendly_date(page_params["date"])
     page_params["year"] = page_params["date"].split("-")[0]
     page_params["post_url"] = (
         page_params["year"] + "/" + page_params["slug"] + "/"
diff --git a/monitor.py b/monitor.py
index 7918ee1..bad2367 100755
--- a/monitor.py
+++ b/monitor.py
@@ -28,7 +28,7 @@ def get_comment_count():
     return 0 if not resp.ok else int(resp.json()["count"])
 
 
-def exit_program():
+def _exit_program():
     """Exit the program with status code 0."""
     sys.exit(0)
 
@@ -52,7 +52,7 @@ while True:
     for _ in range(15):
         time.sleep(60)
         if initial_count != get_comment_count():
-            exit_program()
+            _exit_program()
     # check if git repo changed every 15 minutes
     if external_check_cmd and os.system(external_check_cmd):
-        exit_program()
+        _exit_program()