mention graph vis isn't available in Release builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132916 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ProgrammersManual.html b/docs/ProgrammersManual.html
index 060bbb6..3bec325 100644
--- a/docs/ProgrammersManual.html
+++ b/docs/ProgrammersManual.html
@@ -811,6 +811,10 @@
Attributes</a>.) If you want to restart and clear all the current graph
attributes, then you can <tt>call DAG.clearGraphAttrs()</tt>. </p>
+<p>Note that graph visualization features are compiled out of Release builds
+to reduce file size. This means that you need a Debug+Asserts or
+Release+Asserts build to use these features.</p>
+
</div>
</div>