diff --git a/[refs] b/[refs]
index 36360432360e..f0beb1c0b8e5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cbf9b4bb76c9ce53b7fdde0dffcd000951b5f0d4
+refs/heads/master: 1edf777803bdd2aeeb04cf44508fd9b88737fba8
diff --git a/trunk/arch/i386/Kconfig b/trunk/arch/i386/Kconfig
index c134a545b37e..e34a4dbd6b92 100644
--- a/trunk/arch/i386/Kconfig
+++ b/trunk/arch/i386/Kconfig
@@ -761,6 +761,13 @@ config CRASH_DUMP
 	depends on HIGHMEM
 	help
 	  Generate crash dump after being started by kexec.
+          This should be normally only set in special crash dump kernels
+	  which are loaded in the main kernel with kexec-tools into
+	  a specially reserved region and then later executed after
+	  a crash by kdump/kexec. The crash dump kernel must be compiled
+          to a memory address not used by the main kernel or BIOS using
+          PHYSICAL_START.
+	  For more details see Documentation/kdump/kdump.txt
 
 config PHYSICAL_START
 	hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
diff --git a/trunk/arch/x86_64/Kconfig b/trunk/arch/x86_64/Kconfig
index 6cd4878625f1..927b392a4aa0 100644
--- a/trunk/arch/x86_64/Kconfig
+++ b/trunk/arch/x86_64/Kconfig
@@ -488,7 +488,14 @@ config CRASH_DUMP
 	bool "kernel crash dumps (EXPERIMENTAL)"
 	depends on EXPERIMENTAL
 	help
-		Generate crash dump after being started by kexec.
+          Generate crash dump after being started by kexec.
+          This should be normally only set in special crash dump kernels
+          which are loaded in the main kernel with kexec-tools into
+          a specially reserved region and then later executed after
+          a crash by kdump/kexec. The crash dump kernel must be compiled
+	  to a memory address not used by the main kernel or BIOS using
+	  PHYSICAL_START.
+          For more details see Documentation/kdump/kdump.txt
 
 config PHYSICAL_START
 	hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)