diff --git a/README.md b/README.md
index 522da30..2de3f4d 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ $ make
 $ make install
 ```
 
-To build ACMEd and tacd inside a temporary Docker container, use the `build-docker.sh` helper script. It currently supports Debian Buster / Stretch.
+To build ACMEd and tacd inside a temporary Docker container, use the `contrib/build-docker.sh` helper script. It currently supports Debian Buster / Stretch.
 
 
 ## Frequently Asked Questions
diff --git a/build-docker.sh b/contrib/build-docker.sh
similarity index 100%
rename from build-docker.sh
rename to contrib/build-docker.sh