diff --git a/config.md b/config.md
index ffdae21ae..e050baa28 100644
--- a/config.md
+++ b/config.md
@@ -69,6 +69,7 @@ For Solaris, the mount entry corresponds to the 'fs' resource in the [zonecfg(1M
 
 * **`destination`** (string, REQUIRED) Destination of mount point: path inside container.
     This value MUST be an absolute path.
+    * Linux: It MAY be a relative path too, in which case it MUST be relative to "/".
     * Windows: one mount destination MUST NOT be nested within another mount (e.g., c:\\foo and c:\\foo\\bar).
     * Solaris: corresponds to "dir" of the fs resource in [zonecfg(1M)][zonecfg.1m].
 * **`source`** (string, OPTIONAL) A device name, but can also be a file or directory name for bind mounts or a dummy.