diff --git a/test/images/volume/rbd/README.md b/test/images/volume/rbd/README.md
index df97692aeb7..2bf41c88e77 100644
--- a/test/images/volume/rbd/README.md
+++ b/test/images/volume/rbd/README.md
@@ -1,6 +1,6 @@
 # rbd and ceph target container for testing.
 
-* The container needs to run with docker --privileged
+* The container needs to run with `docker --privileged` mode
 
 block.tar.gz is a small ext2 filesystem created by `create_block.sh` (run as root!)