diff --git a/README.md b/README.md
index ab4bdc9..6ef3b42 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,12 @@ A file called `rss.xml` will be created.
 pyinstaller --onefile rssingle.py
 ```
 
+Old versions
+
+```shell
+docker run --rm --volume $PWD:/app python:3.8-buster /bin/bash -c "cd /app; pip3 install -r requirements.txt; pyinstaller --onefile rssingle.py"
+```
+
 You will find the binary in `dist`.
 
 ## Thanks