diff --git a/arch/arm/mach-rk2818/Kconfig b/arch/arm/mach-rk2818/Kconfig
index 80f6dc76efd7..85029522c4e3 100644
--- a/arch/arm/mach-rk2818/Kconfig
+++ b/arch/arm/mach-rk2818/Kconfig
@@ -47,8 +47,8 @@ config RK28_USB_WAKE
 	depends on ARCH_RK2818 && PM
 	default y
 	help
-	  Select this option if you want to have your system wake up
-	  from USB.
+	  Select this option if you want to have your system wake up from USB.
+	  This will poll usb every second while suspend, so consumes more power.
 
 config WIFI_CONTROL_FUNC
         bool "Enable WiFi control function abstraction"