Add /var/www/html to mountable directories.

Author: linman0x90

README.md

@@ -24,6 +24,6 @@ This repository contains **Dockerfile** of [Nginx](http://nginx.org/) for [Docke
 
 #### Attach persistent/shared directories
 
-    docker run -d -p 80:80 -v <sites-enabled-dir>:/etc/nginx/sites-enabled -v <certs-dir>:/etc/nginx/certs -v <log-dir>:/var/log/nginx dockerfile/nginx
+    docker run -d -p 80:80 -v <sites-enabled-dir>:/etc/nginx/sites-enabled -v <certs-dir>:/etc/nginx/certs -v <log-dir>:/var/log/nginx -v <html-dir>:/var/www/html dockerfile/nginx
 
 After few seconds, open `http://<host>` to see the welcome page.