Don't point readers to rand, point to random! And make it a hyperlink
while you're at it.
Also, when discussing order of reading, make it clear that chapter 2
is assumed background material for the remainder of the manual.
That's needed for terminology if nothing else!
diff --git a/Doc/lib/libintro.tex b/Doc/lib/libintro.tex
index cc0fd86..a4bc67e 100644
--- a/Doc/lib/libintro.tex
+++ b/Doc/lib/libintro.tex
@@ -43,6 +43,10 @@
front of the manual), or look for a specific function, module or term
in the index (in the back). And finally, if you enjoy learning about
random subjects, you choose a random page number (see module
-\module{rand}) and read a section or two.
+\refmodule{random}) and read a section or two. Regardless of the
+order in which you read the sections of this manual, it helps to start
+with chapter \ref{builtin}, ``Built-in Types, Exceptions and
+Functions,'' as the remainder of the manual assumes familiarity with
+this material.
Let the show begin!