diff --git a/[refs] b/[refs]
index 8f5f209617c1..70bd18b94a39 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d3f7eae182b04997be19343a23f7009170f4f7a5
+refs/heads/master: 43fb2387d0774a36f450b50d538cee84cf83858e
diff --git a/trunk/Documentation/i386/zero-page.txt b/trunk/Documentation/i386/zero-page.txt
index 75b3680c41eb..6c0817c45683 100644
--- a/trunk/Documentation/i386/zero-page.txt
+++ b/trunk/Documentation/i386/zero-page.txt
@@ -1,3 +1,13 @@
+---------------------------------------------------------------------------
+!!!!!!!!!!!!!!!WARNING!!!!!!!!
+The zero page is a kernel internal data structure, not a stable ABI.  It might change
+without warning and the kernel has no way to detect old version of it.
+If you're writing some external code like a boot loader you should only use
+the stable versioned real mode boot protocol described in boot.txt. Otherwise the kernel
+might break you at any time.
+!!!!!!!!!!!!!WARNING!!!!!!!!!!!
+----------------------------------------------------------------------------
+
 Summary of boot_params layout (kernel point of view)
      ( collected by Hans Lermen and Martin Mares )