diff --git a/build-tools/docker/README.md b/build-tools/docker/README.md
index fbc0af69248705a1f097e11c50699070be13fa94..77d3ae6960d32556eabb5af82c6b144272dd6d04 100644
--- a/build-tools/docker/README.md
+++ b/build-tools/docker/README.md
@@ -106,5 +106,5 @@ folder under */var* directory. You might not have enough space there for buildin
 folder into another location, where there is enough space.
 
 ```bash
-echo 'DOCKER_OPTS="-g /home/devel5/docker"' > /etc/default/docker
+echo 'DOCKER_OPTS="-g /home/devel5/docker"' >> /etc/default/docker
 ```