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diff --git a/doc/haddock.xml b/doc/haddock.xml
index cb02a1bd..f9a553bc 100644
--- a/doc/haddock.xml
+++ b/doc/haddock.xml
@@ -220,6 +220,15 @@
<para>The modules should <emphasis>not</emphasis> be mutually
recursive, as Haddock don't like swimming in circles.</para>
+ <para>You must also specify an option for the output format.
+ Currently only the <option>-h</option> for HTML is
+ functional.</para>
+
+ <para>The packaging
+ tool <ulink url="http://www.haskell.org/ghc/docs/latest/html/Cabal/index.html">Cabal</ulink>
+ has Haddock support, and is often used instead of invoking Haddock
+ directly.</para>
+
<para>The following options are available:</para>
<variablelist>