Clarifying doc about cross-compiling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191561 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/HowToBuildOnARM.rst b/docs/HowToBuildOnARM.rst
index 32ae39b..f212acd 100644
--- a/docs/HowToBuildOnARM.rst
+++ b/docs/HowToBuildOnARM.rst
@@ -6,7 +6,11 @@
============
This document contains information about building/testing LLVM and
-Clang on ARM.
+Clang on an ARM machine.
+
+This document is *NOT* tailored to help you cross-compile LLVM/Clang
+to ARM on another architecture, for example an x86_64 machine. To find
+out more about cross-compiling, please check :doc:`HowToCrossCompileLLVM`.
Notes On Building LLVM/Clang on ARM
=====================================