diff --git a/zerver/lib/markdown/__init__.py b/zerver/lib/markdown/__init__.py
index 3c88ff0f55..2730b7bece 100644
--- a/zerver/lib/markdown/__init__.py
+++ b/zerver/lib/markdown/__init__.py
@@ -662,8 +662,6 @@ class InlineInterestingLinkProcessor(markdown.treeprocessors.Treeprocessor):
             and (not already_thumbnailed)
             and user_uploads_or_external(image_url)
         ):
-            # See docs/thumbnailing.md for some high-level documentation.
-            #
             # We strip leading '/' from relative URLs here to ensure
             # consistency in what gets passed to /thumbnail
             image_url = image_url.lstrip("/")
diff --git a/zerver/lib/thumbnail.py b/zerver/lib/thumbnail.py
index dfc448098f..f277f3dac0 100644
--- a/zerver/lib/thumbnail.py
+++ b/zerver/lib/thumbnail.py
@@ -1,4 +1,3 @@
-# See https://zulip.readthedocs.io/en/latest/subsystems/thumbnailing.html
 import os
 import sys
 from urllib.parse import urljoin
diff --git a/zerver/views/thumbnail.py b/zerver/views/thumbnail.py
index a40aa22e4e..df242703e3 100644
--- a/zerver/views/thumbnail.py
+++ b/zerver/views/thumbnail.py
@@ -1,4 +1,3 @@
-# See https://zulip.readthedocs.io/en/latest/subsystems/thumbnailing.html
 from typing import Optional, Union
 
 from django.contrib.auth.models import AnonymousUser