diff --git a/docker/python-base/Dockerfile b/docker/python-base/Dockerfile
index 84dc995bb5..f4e709c698 100644
--- a/docker/python-base/Dockerfile
+++ b/docker/python-base/Dockerfile
@@ -23,7 +23,7 @@ RUN apt-get update \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*
 
-# Upgrade pip to fix wheel cache for locally built wheels
+# Upgrade pip to fix wheel cache for locally built wheels.
 # See https://github.com/pypa/pip/issues/6852
 RUN pip install -U pip