diff --git a/README.md b/README.md
index 13875fca6..bdfe5d611 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ docker run \
 To build the Docker image:
 
     make promu
-    promu crossbuild -p linux/amd64 -p linux/armv7 -p linux/amd64 -p linux/ppc64le
+    promu crossbuild -p linux/amd64 -p linux/armv7 -p linux/arm64 -p linux/ppc64le
     make docker
 
 This will build the docker image as `prometheuscommunity/postgres_exporter:${branch}`.