diff --git a/[refs] b/[refs]
index 7c29a6e117a6..eab6c8d5bfff 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 965c0aaafe3e75d4e65cd4ec862915869bde3abd
+refs/heads/master: 3ab0b83bf6a1e834f4b884150d8012990c75d25d
diff --git a/trunk/arch/arm/include/asm/xen/interface.h b/trunk/arch/arm/include/asm/xen/interface.h
index 1d6ef9c2d1d9..5000397134b4 100644
--- a/trunk/arch/arm/include/asm/xen/interface.h
+++ b/trunk/arch/arm/include/asm/xen/interface.h
@@ -29,7 +29,13 @@
 
 #ifndef __ASSEMBLY__
 /* Explicitly size integers that represent pfns in the interface with
- * Xen so that we can have one ABI that works for 32 and 64 bit guests. */
+ * Xen so that we can have one ABI that works for 32 and 64 bit guests.
+ * Note that this means that the xen_pfn_t type may be capable of
+ * representing pfn's which the guest cannot represent in its own pfn
+ * type. However since pfn space is controlled by the guest this is
+ * fine since it simply wouldn't be able to create any sure pfns in
+ * the first place.
+ */
 typedef uint64_t xen_pfn_t;
 #define PRI_xen_pfn "llx"
 typedef uint64_t xen_ulong_t;