restructured library manual accordiung to functional group
diff --git a/Doc/lib/libstruct.tex b/Doc/lib/libstruct.tex
index a2c1b10..4a08c78b 100644
--- a/Doc/lib/libstruct.tex
+++ b/Doc/lib/libstruct.tex
@@ -7,6 +7,9 @@
(explained below) as compact descriptions of the lay-out of the C
structs and the intended conversion to/from Python values.
+See also built-in module \code{array}.
+\bimodindex{array}
+
The module defines the following exception and functions:
\renewcommand{\indexsubitem}{(in module struct)}