diff --git a/INSTALL b/INSTALL
index 05cc4430c..afbb660f3 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,6 +13,9 @@ configuring the GRUB.
 
 * GCC 4.1.3 or later
   Note: older versions may work but support is limited
+
+  Experimental support for clang 3.3 or later (results in much bigger binaries)
+  for i386, x86_64, arm (except thumb), arm64, mips(el), powerpc
   Note: clang 3.2 or later works for i386 and x86_64 targets but results in
         much bigger binaries.
 	earlier versions not tested