Add a comment to the auto-generated docs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60985 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvmc/doc/LLVMC-Reference.rst b/tools/llvmc/doc/LLVMC-Reference.rst
index 3033cfc..66253ee 100644
--- a/tools/llvmc/doc/LLVMC-Reference.rst
+++ b/tools/llvmc/doc/LLVMC-Reference.rst
@@ -1,6 +1,10 @@
 ===================================
 Customizing LLVMC: Reference Manual
 ===================================
+..
+   This file was automatically generated by rst2html.
+   Please do not edit directly!
+   The ReST source lives in the directory 'tools/llvmc/doc'.
 
 .. contents::
 
diff --git a/tools/llvmc/doc/LLVMC-Tutorial.rst b/tools/llvmc/doc/LLVMC-Tutorial.rst
index a27bb20..6f06477 100644
--- a/tools/llvmc/doc/LLVMC-Tutorial.rst
+++ b/tools/llvmc/doc/LLVMC-Tutorial.rst
@@ -1,6 +1,10 @@
 ======================
 Tutorial - Using LLVMC
 ======================
+..
+   This file was automatically generated by rst2html.
+   Please do not edit directly!
+   The ReST source lives in the directory 'tools/llvmc/doc'.
 
 .. contents::