diff --git a/runner-lxc.md b/runner-lxc.md
index 6b328f7..8e876d6 100644
--- a/runner-lxc.md
+++ b/runner-lxc.md
@@ -10,7 +10,7 @@ The runners it contains are not started at boot, it must be done manually. The b
 ### Installation
 
 ```shell
-version=3.5.0
+version=4.0.1
 sudo wget -O /usr/local/bin/forgejo-runner-$version https://code.forgejo.org/forgejo/runner/releases/download/v$version/forgejo-runner-$version-linux-amd64
 sudo chmod +x /usr/local/bin/forgejo-runner-$version
 echo 'export TERM=xterm-256color' >> .bashrc
@@ -35,10 +35,33 @@ containers, the labels in `config.yml` should be
 ```shell
 name=myrunner
 mkdir -p $DIR ; cd $DIR
-forgejo-runner generate-config > config-$name.yml
+forgejo-runner-$version generate-config > config-$name.yml
 ## edit config-$name.yml and adjust the `labels:`
 ## Obtain a $TOKEN from https://$DIR
 forgejo-runner-$version register --no-interactive --token $TOKEN --name runner --instance https://codeberg.org
 forgejo-runner-$version --config config-$name.yml daemon |& cat -v > runner.log &
 ```
 
+### Removing old docker images
+
+[docuum](https://github.com/stepchowfun/docuum)
+
+```sh
+curl https://raw.githubusercontent.com/stepchowfun/docuum/main/install.sh -LSfs | sh
+sudo tee /etc/systemd/system/docuum.service <<'EOF'
+[Unit]
+Description=Docuum
+After=docker.service
+Wants=docker.service
+
+[Service]
+Environment='THRESHOLD=10 GB'
+ExecStart=/usr/local/bin/docuum --threshold ${THRESHOLD}
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target
+EOF
+sudo systemctl enable docuum --now
+sudo journalctl --follow --unit docuum
+```