diff --git a/README.md b/README.md
index 1ee1af1..8196163 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Usage
 - Make sure you have my `Dockerfile`, `.dockerignore` and the `bootstrap.tar.gz` in one directory.
 - Build the image with a command like:
 
-        docker build --tag hyperbola:0.4.3 -f Dockerfile-Hyperbola-v04 .
+        docker build --tag hyperbola:v0.4.3 -f Dockerfile-Hyperbola-v04 .
 
 License
 =======