-You also need a few other tools installed: Happy [4], Alex [5], and
-Haddock [6] (for building library documentation), and a good DocBook
-XML toolchain if you want to build the compiler documentation.
+If you're building from darcs sources (as opposed to a source
+distribution) then you also need to install Happy [4] and Alex [5].
+
+For building library documentation, you'll need Haddock [6]. To build
+the compiler documentation, you need a good DocBook XML toolchain.