diff --git a/ChangeLog b/ChangeLog
index 21657da55..35238c6df 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-12-10  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Added --bt-prioritize-piece option to aria2rpc.
+	* doc/xmlrpc/aria2rpc
+
 2009-12-10  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Refer Magnet URI in --help. Made some cosmetic changes.
diff --git a/doc/xmlrpc/aria2rpc b/doc/xmlrpc/aria2rpc
index da61e6839..7402ee3fa 100755
--- a/doc/xmlrpc/aria2rpc
+++ b/doc/xmlrpc/aria2rpc
@@ -96,6 +96,9 @@ OptionParser.new do |opt|
   opt.on("--bt-min-crypto-level LEVEL",["plain","arc4"]){|val|
     options["bt-min-crypto-level"]=val
   }
+  opt.on("--bt-prioritize-piece RANGE") {|val|
+    options["bt-prioritize-piece"]=val
+  }
   opt.on("--bt-require-crypto BOOL",["true","false"]){|val|
     options["bt-require-crypto"]=val
   }