diff --git a/build/docker/README.md b/build/docker/README.md
index 113c03d21b5..5a0997cf121 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -6,6 +6,10 @@ Before build/run, define the variable HOST_USER_ID as following:
 
         export HOST_USER_ID=$(id -u)
 
+Go in repository build/docker :
+
+        cd build/docker
+
 And then, you can run :
 
         docker-compose up