Implement IDNA (Internationalized Domain Names in Applications).
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index 755023d..5faeedc 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -112,6 +112,7 @@
 \input{libtextwrap}
 \input{libcodecs}
 \input{libunicodedata}
+\input{libstringprep}
 
 \input{libmisc}                 % Miscellaneous Services
 \input{libpydoc}