diff --git a/ChangeLog b/ChangeLog
index 967f54bf3b..ce823ceef6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Nov  4 13:09:31 2006  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* lib/net/imap.rb: accept NOMODSEQ. [ruby-core:9002]
+
 Fri Nov  3 00:16:37 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* ext/socket/socket.c (ruby_getnameinfo__aix): AF_INET6 workaround
diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 21f85bf57c..d7c34ad961 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -2637,7 +2637,7 @@ module Net
         token = match(T_ATOM)
         name = token.value.upcase
         case name
-        when /\A(?:ALERT|PARSE|READ-ONLY|READ-WRITE|TRYCREATE)\z/n
+        when /\A(?:ALERT|PARSE|READ-ONLY|READ-WRITE|TRYCREATE|NOMODSEQ)\z/n
           result = ResponseCode.new(name, nil)
         when /\A(?:PERMANENTFLAGS)\z/n
           match(T_SPACE)