diff --git a/doc/guide/preamble.sdf b/doc/guide/preamble.sdf
index 179428f176..759cfc07d1 100644
--- a/doc/guide/preamble.sdf
+++ b/doc/guide/preamble.sdf
@@ -132,8 +132,8 @@ OpenLDAP|http://www.openldap.org/software/
 OpenSSL|http://www.openssl.org/
 Perl|http://www.perl.com/
 SASL|http://asg.web.cmu.edu/sasl/
-SQL|http://www.sql.com/
-TCL|http://www.tcl.com/
+SQL|http://www.jcc.com/SQLPages/jccs_sql.htm
+TCL|http://www.scriptics.com/
 !endblock
 
 # Internet and X.500 terms