diff --git a/README.md b/README.md
index 8423615..5b84e43 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Detailed instructions on hosting a knot can be found at [knot-hosting](https://t
 These instructions assume a user `www-data` on the host for Docker to use.
 
 1. In `knot-docker` directory, create Docker image with
-   `docker build -t knot:latest --build-arg TAG=main --build-arg UID=$(id -u www-data) --build-arg GID=$(id -u www-data) .`
+   `docker build -t knot:latest --build-arg TAG=master --build-arg UID=$(id -u www-data) --build-arg GID=$(id -u www-data) .`
 2. In this directory, create bind mount directories with `mkdir keys repositories server`
 3. Ensure `repositories` and `server` are owned by `www-data`
    with `chown www-data:www-data repositories server`