diff --git a/README.md b/README.md
index 5126ab8..f7fa3f5 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,7 @@ ### Options when running the script <a name="options"></a>
                         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 works if script is running from a boot-up schedule
                         Only needed if NVMe volume or PCIe card need a 2nd 
                         reboot after DSM update
   -h, --help            Show this help message