diff --git a/ChangeLog b/ChangeLog
index c602ba43..c0cc6786 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-08-25  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Bump up DHT version to 2.
+	* src/DHTConstants.h
+
 2010-08-25  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Added error message when given address and resolved address do not
diff --git a/src/DHTConstants.h b/src/DHTConstants.h
index 09e9e5ae..8469e7ca 100644
--- a/src/DHTConstants.h
+++ b/src/DHTConstants.h
@@ -36,8 +36,8 @@
 #define _D_DHT_CONSTANTS_H_
 
 // Increment this if major improvements or bug fixes are made in DHT
-// code.
-#define DHT_VERSION 1
+// code. This is 2 bytes unsigned integer.
+#define DHT_VERSION 2
 
 #define DHT_ID_LENGTH 20