diff --git a/configure b/configure
index b50b54182..670a7ba4c 100755
--- a/configure
+++ b/configure
@@ -1427,7 +1427,10 @@ Optional Packages:
                           and DIR/lib.
   --with-libpcre=included Always use the version included with Nmap
   --with-libdnet=DIR      Use an existing (compiled) dnet lib from DIR/include
-                          and DIR/lib.
+                          and DIR/lib. This is NOT RECOMMENDED because we have
+                          made many important fixes to libdnet, as described
+                          at
+                          http://nmap.org/svn/libdnet-stripped/NMAP_MODIFICATIONS
   --with-libdnet=included Use the libdnet version included with Nmap (default)
   --with-liblua=DIR       Use an existing (compiled) lua lib from DIR/include
                           and DIR/lib.
@@ -7774,7 +7777,8 @@ LIBDNETDIR=libdnet-stripped
 # Unlike the other included libraries (pcap, pcre, lua), we prefer our local
 # copy of libdnet. That is, with the other libraries we check for a system
 # version by default, whereas with dnet we use the local version unless
-# specifically asked to use a system version.
+# specifically asked to use a system version.  This is because we have
+# made many improvements and fixes to our version od dnet.
 
 # Check whether --with-libdnet was given.
 if test "${with_libdnet+set}" = set; then
diff --git a/configure.ac b/configure.ac
index d7ea3243d..c5c4f7fc4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -464,9 +464,10 @@ LIBDNETDIR=libdnet-stripped
 # Unlike the other included libraries (pcap, pcre, lua), we prefer our local
 # copy of libdnet. That is, with the other libraries we check for a system
 # version by default, whereas with dnet we use the local version unless
-# specifically asked to use a system version.
+# specifically asked to use a system version.  This is because we have
+# made many improvements and fixes to our version od dnet.
 AC_ARG_WITH(libdnet,
-AC_HELP_STRING([--with-libdnet=DIR], [Use an existing (compiled) dnet lib from DIR/include and DIR/lib.])
+AC_HELP_STRING([--with-libdnet=DIR], [Use an existing (compiled) dnet lib from DIR/include and DIR/lib. This is NOT RECOMMENDED because we have made many important fixes to our included libdnet, as described at http://nmap.org/svn/libdnet-stripped/NMAP_MODIFICATIONS])
 AC_HELP_STRING([--with-libdnet=included], [Use the libdnet version included with Nmap (default)]),
 [  case "$with_libdnet" in
   yes)