diff --git a/README.md b/README.md
index 7cba0a2..13447f0 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ cert_before=$(sha256sum "${cert}")
 docker run --name certbot-renew \
     -v "${path}/www:/var/www/:rw" \
     -v "${path}/cert/:/etc/letsencrypt/:rw" \
-    --detach \
+    --rm \
     certbot/certbot \
     certonly --non-interactive --agree-tos --webroot \
             --webroot-path /var/www/ \
@@ -104,4 +104,4 @@ docker rm mptcp-check
 then run the `start.sh` script again.
 
 ## update needs
-Currently, the apt version of lighttpd is 1.4.63. When the 1.4.76 or newer version is available, `mptcpize run` can be removed from the `Dockerfile` file, and the option `"server.network-mptcp"` can be set in the config.
\ No newline at end of file
+Currently, the apt version of lighttpd is 1.4.63. When the 1.4.76 or newer version is available, `mptcpize run` can be removed from the `Dockerfile` file, and the option `"server.network-mptcp"` can be set in the config.