diff --git a/test/images/volume/rbd/README.md b/test/images/volume/rbd/README.md
index 2bf41c88e77..1630be89df8 100644
--- a/test/images/volume/rbd/README.md
+++ b/test/images/volume/rbd/README.md
@@ -2,7 +2,7 @@
 
 * 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!)
+`block.tar.gz` is a small ext2 filesystem created by `create_block.sh` (run as root!)
 
 # Credentials