diff --git a/docs/building.md b/docs/building.md
index bf62c3e2..30e1b5d9 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -49,7 +49,7 @@ Now create the directory for the registry data (this might require you to set pe
 The `registry`
 binary can then be run with the following:
 
-    $ $GOPATH/bin/registry -version
+    $ $GOPATH/bin/registry --version
     $GOPATH/bin/registry github.com/docker/distribution v2.0.0-alpha.1+unknown
 
 > __NOTE:__ While you do not need to use `go get` to checkout the distribution