diff --git a/README.org b/README.org
index 69f25c3..2ae81c5 100644
--- a/README.org
+++ b/README.org
@@ -92,7 +92,7 @@
     A self-contained =Dockerfile=, based on [[https://www.alpinelinux.org/][Alpine Linux]], is available in the repository.
     You can use it to build a /raincloud/ image locally with the following command:
 
-    : $ docker build -t raincloud:latest -f Dockerfile
+    : $ docker build -t raincloud:latest -f <(curl https://raw.githubusercontent.com/Deleh/raincloud/master/Dockerfile)
 
     A container of the image exposes raincloud at port =8000= and uses the base directory =/var/www/raincloud=.
     Use dockers =-p= flag to map the port on your host and =-v= flag to mount a local base directory: