diff --git a/[refs] b/[refs]
index e427d3d06759..4818ff8e8d41 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7d12e522ba13ce718b7ec32b75803dece8adb072
+refs/heads/master: e685752de107201432a055f7c45c396a5b04dc17
diff --git a/trunk/arch/ppc64/Kconfig.debug b/trunk/arch/ppc64/Kconfig.debug
index e341a129da80..46b1ce58da3b 100644
--- a/trunk/arch/ppc64/Kconfig.debug
+++ b/trunk/arch/ppc64/Kconfig.debug
@@ -5,6 +5,9 @@ source "lib/Kconfig.debug"
 config DEBUG_STACKOVERFLOW
 	bool "Check for stack overflows"
 	depends on DEBUG_KERNEL
+	help
+	  This option will cause messages to be printed if free stack space
+	  drops below a certain limit.
 
 config KPROBES
 	bool "Kprobes"