diff --git a/doc/source/install/developer/all-in-one.rst b/doc/source/install/developer/all-in-one.rst
index f3f5c9175d..9f6375bd8e 100644
--- a/doc/source/install/developer/all-in-one.rst
+++ b/doc/source/install/developer/all-in-one.rst
@@ -139,6 +139,7 @@ It is recommended to pull the kubeadm-aio container as it is stable
 at the time it was built
 
 ::
+
     export KUBEADM_IMAGE=openstackhelm/kubeadm-aio:v1.7.5
     sudo docker pull ${KUBEADM_IMAGE}