diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 8f1f97d..be60971 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -1168,6 +1168,12 @@
 	default n
 	help
 	  Enable General-Purpose Wake-Up (Voltage Regulator Power-Up)
+	  (all processors, except ADSP-BF549). This option sets
+	  the general-purpose wake-up enable (GPWE) control bit to enable
+	  wake-up upon detection of an active low signal on the /GPW (PH7) pin.
+	  On ADSP-BF549 this option enables the the same functionality on the
+	  /MRXON pin also PH7.
+
 endmenu
 
 menu "CPU Frequency scaling"