+ <para>
+ Note that we use <literal>pseq</literal> rather
+ than <literal>seq</literal>. The two are almost equivalent, but
+ differ in their runtime behaviour in a subtle
+ way: <literal>seq</literal> can evaluate its arguments in either
+ order, but <literal>pseq</literal> is required to evaluate its
+ first argument before its second, which makes it more suitable
+ for controlling the evaluation order in conjunction
+ with <literal>par</literal>.
+ </para>
+