diff --git a/utils/dc-chain/docker/Dockerfile b/utils/dc-chain/docker/Dockerfile
index 1a94b6cc7..b20aff769 100644
--- a/utils/dc-chain/docker/Dockerfile
+++ b/utils/dc-chain/docker/Dockerfile
@@ -3,7 +3,7 @@
 #
 # usage:
 #   - build one of the images:
-#       docker build -t dcchain:stable --build-arg dc_chain=stable --build-arg makejobs=8 .
+#       docker build -t dcchain:stable --build-arg dc_chain=stable --build-arg default_precision=m4-single .
 #       docker build -t dcchain:legacy --build-arg dc_chain=legacy --build-arg makejobs=4 .
 #       docker build -t dcchain:dev --build-arg dc_chain=dev --build-arg makejobs=4 --build-arg enable_objc=0 --build-arg enable_objcpp=0 .
 #   - create and run a container, e.g. for stable: