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-rw-r--r--docs/ReleaseNotes.html4
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diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
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@@ -174,7 +174,9 @@ For more details about the changes to Clang since the 2.9 release, see the
<li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
GCC's optimizers as well as LLVM's, now works much better. This is the
option to use if you want ultimate performance! It is still experimental
- though: it may cause the plugin to crash.</li>
+ though: it may cause the plugin to crash. Setting the optimization level
+ to <tt>-O4</tt> when using this option will optimize even harder, though
+ this usually doesn't result in any improvement over <tt>-O3<tt>.</li>
<li>The type and constant conversion logic has been almost entirely rewritten,
fixing a multitude of obscure bugs.</li>