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-rw-r--r--llvm/docs/ProgrammersManual.html4
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diff --git a/llvm/docs/ProgrammersManual.html b/llvm/docs/ProgrammersManual.html
index 060bbb6d91b..3bec325d6ce 100644
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+++ b/llvm/docs/ProgrammersManual.html
@@ -811,6 +811,10 @@ found at <a href="http://www.graphviz.org/doc/info/attrs.html">Graph
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>
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