diff --git a/xCAT-server/lib/xcat/plugins/ipmi.pm b/xCAT-server/lib/xcat/plugins/ipmi.pm
index 1d7abb317..8126558c8 100644
--- a/xCAT-server/lib/xcat/plugins/ipmi.pm
+++ b/xCAT-server/lib/xcat/plugins/ipmi.pm
@@ -3905,8 +3905,8 @@ sub getaddsensorevent {
 				0x0f => "Enabling docking station",
 				0x10 => "Docking staion ejection",
 				0x11 => "Disable docking station",
-				0x12 => "Calling operation system wake-up vector",
-				0x13 => "Starting operation system boot process, call init 19h",
+				0x12 => "Calling operating system wake-up vector",
+				0x13 => "Starting operating system boot process, call init 19h",
 				0x14 => "Baseboard or motherboard initialization",
 				0x16 => "Floppy initialization",
 				0x17 => "Keyboard test",