diff --git a/doc/guide/plain.sdf b/doc/guide/plain.sdf
index 9efa4d1b0a..f1b9db0159 100644
--- a/doc/guide/plain.sdf
+++ b/doc/guide/plain.sdf
@@ -13,7 +13,7 @@
 !macro HTML_FOOTER
 {{INLINE:<FONT COLOR="#808080" FACE="Arial,Verdana,Helvetica" SIZE="1">}}
 {{INLINE:<B>________________<BR><SMALL>}}
-[[c]]  Copyright 2011,
+[[c]]  Copyright 2011-2021,
 {{INLINE:<A HREF="/foundation/">OpenLDAP Foundation</A>}},
 {{EMAIL: info@OpenLDAP.org}}
 {{INLINE:</SMALL><BR></B></FONT>}}
diff --git a/doc/guide/preamble.sdf b/doc/guide/preamble.sdf
index 932b5e4bf8..9c98af47de 100644
--- a/doc/guide/preamble.sdf
+++ b/doc/guide/preamble.sdf
@@ -55,7 +55,7 @@
 <P>
 <FONT COLOR="#808080" FACE="Arial,Verdana,Helvetica" SIZE="1"><B>
 ________________<BR>
-<SMALL>&copy; Copyright 2011, <A HREF="http://www.OpenLDAP.org/foundation/">OpenLDAP Foundation</A>, <A HREF="mailto:info@OpenLDAP.org">info@OpenLDAP.org</A></SMALL></B></FONT>
+<SMALL>&copy; Copyright 2011-2021, <A HREF="http://www.OpenLDAP.org/foundation/">OpenLDAP Foundation</A>, <A HREF="mailto:info@OpenLDAP.org">info@OpenLDAP.org</A></SMALL></B></FONT>
 
 	!endblock
 !endmacro