diff --git a/llvm/docs/CFEBuildInstrs.html b/llvm/docs/CFEBuildInstrs.html
index d03759da80d7..ebcfa845effd 100644
--- a/llvm/docs/CFEBuildInstrs.html
+++ b/llvm/docs/CFEBuildInstrs.html
@@ -66,6 +66,11 @@ located in a top-level directory (like <tt>/cygdrive/c/llvm</tt> and
 (which includes your "home directory", because it lives under the "Documents 
 and Settings" directory).  We welcome patches to fix this issue.
 </p>
+<p>It has been found that the GCC 3.3.3 compiler provided with recent Cygwin
+versions is incapable of compiling the LLVM CFE correctly. If your Cygwin
+installation includes GCC 3.3.3 we <i>strongly</i> recommend that you download
+GCC 3.4.3, build it separately, and use it for compiling LLVM CFE. This has been
+shown to work correctly.</p>
 </div>
 
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