Add imaplib to appropriate lists.
diff --git a/Doc/lib/libwww.tex b/Doc/lib/libwww.tex
index 89799f6..9494e47 100644
--- a/Doc/lib/libwww.tex
+++ b/Doc/lib/libwww.tex
@@ -30,6 +30,9 @@
 \item[gopherlib]
 --- Gopher protocol client (requires sockets).
 
+\item[imaplib]
+--- IMAP4 protocol client (requires sockets).
+
 \item[nntplib]
 --- NNTP protocol client (requires sockets).