diff --git a/README.md b/README.md
index 1999988..5126ab8 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,9 @@ ### Options when running the script <a name="options"></a>
                         recent model IronWolf and IronWolf Pro drives.
                         For NAS with x86_64 CPUs only.
                         Also installs IHM on '22 series and newer models (untested)
+      --reboot          Reboot after a DSM update when build number has changed
+                        Only needed if NVMe volume or PCIe card need a 2nd 
+                        reboot after DSM update
   -h, --help            Show this help message
   -v, --version         Show the script version
 ```