diff --git a/README.md b/README.md
index b9148b5c..2109cd53 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ jobs:
         with:
           architecture: armv7
           distribution: ubuntu18.04
+          additionalArgs: <additional args for architecture specific docker, optional>
           run: |
             uname -a
             echo ::set-output name=uname::$(uname -a)