diff --git a/ChangeLog b/ChangeLog
index fef4067aee..68e278a523 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Feb 14 17:28:24 2001  Shugo Maeda <shugo@ruby-lang.org>
+
+	* lib/net/imap.rb: supports unknown resp_text_code.
+
 Wed Feb 14 00:44:17 2001  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* dir.c (dir_s_glob): supprt backslash escape of metacharacters
diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 34d324ed12..23b22c0282 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -1475,6 +1475,12 @@ module Net
 	when /\A(?:UIDVALIDITY|UIDNEXT|UNSEEN)\z/n
 	  match(T_SPACE)
 	  result = ResponseCode.new(name, number)
+	else
+	  match(T_SPACE)
+	  @lex_state = EXPR_CTEXT
+	  token = match(T_TEXT)
+	  @lex_state = EXPR_BEG
+	  result = ResponseCode.new(name, token.value)
 	end
 	match(T_RBRA)
 	@lex_state = EXPR_RTEXT