diff --git a/storage/volumes.md b/storage/volumes.md
index b8c2f7763c..163b9e5079 100644
--- a/storage/volumes.md
+++ b/storage/volumes.md
@@ -72,7 +72,7 @@ If you need to specify volume driver options, you must use `--mount`.
     is mounted in the container. May be specified as `destination`, `dst`,
     or `target`.
   - The `readonly` option, if present, causes the bind mount to be [mounted into
-    the container as read-only](#use-a-read-only-volume).
+    the container as read-only](#use-a-read-only-volume). May be specified as `readonly` or `ro`.
   - The `volume-opt` option, which can be specified more than once, takes a
     key-value pair consisting of the option name and its value.