vb.org Archive - Force Read more ... link to appear in RSS exporter

I want to force a link to the thread to appear in the first part or any part if used / grabbed in RSS aggregator
any ideas
simply i think the link will be like :

HTML Code:

<a href="showthread.php?$session[sessionurl]t=$threadid">Read more ...</a>

but wher to put it to appear in rss?

--------------- Added [DATE]1255309042[/DATE] at [TIME]1255309042[/TIME] ---------------

here is a piece of code in external.php:

Code:

$postbit_obj =& $postbit_factory->fetch_postbit('external');

                                                $message = $postbit_obj->construct_postbit($thread);

                                                $xml->add_tag('content:encoded', $message);

                                                unset($message);

so i need $message to be a link for the thread for example or added link read more after it

X vBulletin 3.8.12 by vBS Debug Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)bbcode_code_printable (1)bbcode_html_printable (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (1)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages:

X vBulletin 3.8.12 by vBS Debug Information

Page Generation 0.02134 seconds
Memory Usage 1,707KB
Queries Executed 10 (?)

More Information

Template Usage:

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./includes/init.php
./includes/class_core.php
./includes/config.php
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./includes/class_hook.php
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./includes/class_bbcode.php
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Hooks Called:

init_startup
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Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.02134 seconds Memory Usage 1,707KB Queries Executed 10 (?)
More Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)bbcode_code_printable (1)bbcode_html_printable (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (1)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages: