diff --git a/ext/dbx/howto_extend_dbx.html b/ext/dbx/howto_extend_dbx.html
index 1f9e57977ca..9b1ba6e4f3a 100644
--- a/ext/dbx/howto_extend_dbx.html
+++ b/ext/dbx/howto_extend_dbx.html
@@ -50,7 +50,7 @@ a               { color: #000088; }
 How-to code support for another database<br>
 </div>
 <div class="text">
-Every supported database module must be loaded by PHP before it can be used. Every supported database module must be added to the dbx-module before it can be used. Currently there is support for MySQL, PostgreSQL, Microsoft SQL Server and ODBC, but it is not difficult to add support for more databases.<br>
+Every supported database module must be loaded by PHP before it can be used. Every supported database module must be added to the dbx-module before it can be used. Currently there is support for MySQL, PostgreSQL, Microsoft SQL Server, Frontbase, Sybase-CT and ODBC, but it is not difficult to add support for more databases.<br>
 <br>
 The dbx module is found in de PHP ext/dbx folder. The support-code is found in the same folder <br>
 <br>