diff --git a/Using-the-SD-Card.md b/Using-the-SD-Card.md
index 5428a54..0edc76b 100644
--- a/Using-the-SD-Card.md
+++ b/Using-the-SD-Card.md
@@ -29,6 +29,8 @@ Mount the SD card
 
 Run file \FOO.NC 
 
+Note: If in alarm mode command will fail with error 9
+
 ## Other Actions
 
 **Pause/Restart**