diff --git a/README.md b/README.md
index e74aad1..39f6c9b 100755
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ IMG_NAME='Raspbian'
 The config file can also be specified on the command line as an argument the `build.sh` or `build-docker.sh` scripts.
 
 ```
-./build -c myconfig
+./build.sh -c myconfig
 ```
 
 This is parsed after `config` so can be used to override values set there.