diff --git a/README.md b/README.md
index 26d5bf5..7f009ee 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,10 @@ docker run -it --rm --name certbot \
 
 - create nginx.conf like in example
 
-`docker run --name nginx -d -p 80:80 -p 443:443/tcp -p 443:443/udp -v ${PWD}/temp/letsencrypt/:/opt/nginx/certs/ -v ${PWD}/nginx.conf:/etc/nginx/nginx.conf  ymuski/nginx-http3`
+```sh
+# NOTE: --priviliged needed for setsockopt(SO_TXTIME) access
+docker run --name nginx --priviliged -d -p 80:80 -p 443:443/tcp -p 443:443/udp -v ${PWD}/temp/letsencrypt/:/opt/nginx/certs/ -v ${PWD}/nginx.conf:/etc/nginx/nginx.conf  ymuski/nginx-http3
+```
 
 
 ### Checking