diff --git a/ChangeLog b/ChangeLog
index 404f0efe..952eda23 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-08-22  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Updated usage.
+	* src/usage_text.h
+
 2010-08-22  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Updated README
diff --git a/src/usage_text.h b/src/usage_text.h
index 6c805c01..ca784a99 100644
--- a/src/usage_text.h
+++ b/src/usage_text.h
@@ -715,8 +715,10 @@
     "                              DNS resolver. This option will be ignored when\n" \
     "                              --async-dns=false.")
 #define TEXT_ENABLE_DHT6                        \
-  _(" --enable-dht6[=true|false]   Enable IPv6 DHT functionality. See also\n" \
-    "                              --dht-listen-addr6 option.")
+  _(" --enable-dht6[=true|false]   Enable IPv6 DHT functionality.\n" \
+    "                              Use --dht-listen-port option to specify port\n" \
+    "                              number to listen on. See also --dht-listen-addr6\n" \
+    "                              option.")
 #define TEXT_DHT_LISTEN_ADDR6                   \
   _(" --dht-listen-addr6=ADDR      Specify address to bind socket for IPv6 DHT. \n" \
     "                              It should be a global unicast IPv6 address of the\n" \