diff --git a/src/main.rs b/src/main.rs
index a1956edbe1..74dc74a88e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2970,7 +2970,7 @@ iommu=on|off - indicates whether to enable virtio IOMMU for this device"),
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
           Argument::flag("host-cpu-topology", "Use mirror cpu topology of Host for Guest VM, also copy some cpu feature to Guest VM."),
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
-          Argument::flag("itmt", "Enable ITMT scheduling feature."),
+          Argument::flag("itmt", "Allow to enable ITMT scheduling feature in VM. The success of enabling depends on HWP and ACPI CPPC support on hardware."),
           Argument::flag("privileged-vm", "Grant this Guest VM certian privileges to manage Host resources, such as power management."),
           Argument::value("stub-pci-device", "DOMAIN:BUS:DEVICE.FUNCTION[,vendor=NUM][,device=NUM][,class=NUM][,subsystem_vendor=NUM][,subsystem_device=NUM][,revision=NUM]", "Comma-separated key=value pairs for setting up a stub PCI device that just enumerates. The first option in the list must specify a PCI address to claim.
                               Optional further parameters