-The <Literal>ST</Literal> library, which provides access to the <Function>ST</Function> monad, is a
-GHC/Hugs extension library and is described in the separate <ULink
-URL="libs.html"
->GHC/Hugs Extension Libraries</ULink
-> document.
+The <Literal>ST</Literal> library, which provides access to the
+<Function>ST</Function> monad, is described in <xref
+linkend="sec-ST">.