diff --git a/README.md b/README.md
index 5656cb3..fd502a3 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ Usage: ./package.sh -p project_path [-d destination] [-i image] [-k]
 Parameters:
 
   -p Path to the project to build
+  -a Optional : Architecture choice (-a i386 for example)
   -d Optional : Destination of the builed packages (default ./packages)
   -i Optional : Name of the Docker image to use for build (default: debian:jessie)
   -k Optional : Keep the Docker container after build