diff --git a/doc/defines.texi.in b/doc/defines.texi.in
index 8a5867a..1dd0cb0 100644
--- a/doc/defines.texi.in
+++ b/doc/defines.texi.in
@@ -4,7 +4,7 @@
 @c Set variables
 @set PACKAGE_NAME @PACKAGE_NAME@
 @set AUTHORS Kunihiro Ishiguro, et al.
-@set COPYRIGHT_YEAR 1999-2004
+@set COPYRIGHT_YEAR 1999-2005
 @set COPYRIGHT_STR Copyright @copyright{} @value{COPYRIGHT_YEAR} @value{AUTHORS}
 
 @c These may vary with installation environment.