diff --git a/tools/docker/core/Dockerfile b/tools/docker/core/Dockerfile
index 91b90a4a2..02222008b 100644
--- a/tools/docker/core/Dockerfile
+++ b/tools/docker/core/Dockerfile
@@ -14,6 +14,9 @@ WORKDIR /opt/certbot
 
 # Copy certbot code
 COPY CHANGELOG.md README.rst src/
+# We keep the relative path to the requirements file the same because, as of
+# writing this, tools/pip_install.py is used in the Dockerfile for Certbot
+# plugins and this script expects to find the requirements file there.
 COPY letsencrypt-auto-source/pieces/dependency-requirements.txt letsencrypt-auto-source/pieces/
 COPY tools tools
 COPY acme src/acme
diff --git a/tools/pipstrap.py b/tools/pipstrap.py
index a77a08af8..2f21a9a5f 100755
--- a/tools/pipstrap.py
+++ b/tools/pipstrap.py
@@ -12,6 +12,10 @@ import pip_install
 # We include the hashes of the packages here for extra verification of
 # the packages downloaded from PyPI. This is especially valuable in our
 # builds of Certbot that we ship to our users such as our Docker images.
+#
+# An older version of setuptools is currently used here in order to keep
+# compatibility with Python 2 since newer versions of setuptools have dropped
+# support for it.
 REQUIREMENTS = r"""
 pip==20.2.4 \
     --hash=sha256:51f1c7514530bd5c145d8f13ed936ad6b8bfcb8cf74e10403d0890bc986f0033 \