diff --git a/admin/admin_log.php b/admin/admin_log.php
index 01dbba373..f5c665187 100644
--- a/admin/admin_log.php
+++ b/admin/admin_log.php
@@ -235,6 +235,7 @@ if ($log_rowset) {
             case $log_type['mod_post_pin']:
             case $log_type['mod_post_unpin']:
             case $log_type['mod_topic_split']:
+            case $log_type['mod_topic_attach_updated']:
                 // topic_title
                 if (!empty($row['log_topic_title'])) {
                     $topic_title = $row['log_topic_title'];
diff --git a/library/language/source/main.php b/library/language/source/main.php
index 1a4b56a5c..b7f1c348b 100644
--- a/library/language/source/main.php
+++ b/library/language/source/main.php
@@ -2835,6 +2835,7 @@ $lang['LOG_ACTION']['LOG_TYPE'] = [
     'mod_topic_tor_unregister' => 'Topic:<br /> <b>torrent unregistered</b>',
     'mod_topic_tor_register' => 'Topic:<br /> <b>torrent registered</b>',
     'mod_topic_tor_delete' => 'Topic:<br /> <b>torrent deleted</b>',
+    'mod_topic_attach_updated' => 'Topic:<br /> <b>attachment updated</b>',
     'mod_topic_renamed' => 'Topic:<br /> <b>renamed</b>',
     'mod_post_delete' => 'Post:<br /> <b>deleted</b>',
     'mod_post_pin' => 'Post:<br /> <b>pinned</b>',
diff --git a/posting.php b/posting.php
index f823d5a66..024f6b17e 100644
--- a/posting.php
+++ b/posting.php
@@ -372,6 +372,16 @@ if (($delete || $mode == 'delete') && !$confirm) {
 
         if (!$error_msg) {
             \TorrentPier\Legacy\Post::user_notification($mode, $post_data, $post_info['topic_title'], $forum_id, $topic_id, $notify_user);
+
+            if (defined('ATTACHMENT_UPDATED') && ATTACHMENT_UPDATED['status']) {
+                global $log_action;
+                $log_action->mod('mod_topic_attach_updated', [
+                    'forum_id' => $forum_id,
+                    'topic_id' => $topic_id,
+                    'topic_title' => $post_info['topic_title'],
+                    'log_msg' => sprintf('Attachment type: %s', ATTACHMENT_UPDATED['attachment_type'])
+                ]);
+            }
         }
 
         if ($mode == 'newtopic' || $mode == 'reply') {
diff --git a/src/Legacy/Attach.php b/src/Legacy/Attach.php
index ae0eefedc..3cff7b424 100644
--- a/src/Legacy/Attach.php
+++ b/src/Legacy/Attach.php
@@ -475,18 +475,25 @@ class Attach
                         // Delete the Old Attachment
                         unlink_attach($row['physical_filename']);
 
+                        $attachment_type = $lang['ATTACHMENT'];
+
                         if ((int)$row['thumbnail'] === 1) {
                             unlink_attach($row['physical_filename'], MODE_THUMBNAIL);
+                            $attachment_type = $lang['ATTACHMENT_THUMBNAIL'];
                         }
 
-                        // todo: log action - torrent updated
-
                         //bt
                         if ($this->attachment_extension_list[$actual_element] === TORRENT_EXT && $attachments[$actual_element]['tracker_status']) {
                             Torrent::tracker_unregister($attachment_id);
+                            $attachment_type = $lang['TORRENT'];
                         }
                         //bt end
 
+                        \define('ATTACHMENT_UPDATED', [
+                            'status' => true,
+                            'attachment_type' => $attachment_type
+                        ]);
+
                         // Make sure it is displayed
                         $this->attachment_list[$actual_element] = $this->attach_filename;
                         $this->attachment_comment_list[$actual_element] = $comment;
diff --git a/src/Legacy/LogAction.php b/src/Legacy/LogAction.php
index e4af99bb7..4b11ad65e 100644
--- a/src/Legacy/LogAction.php
+++ b/src/Legacy/LogAction.php
@@ -35,6 +35,7 @@ class LogAction
         'mod_topic_tor_unregister' => 17,
         'mod_topic_tor_register' => 18,
         'mod_topic_tor_delete' => 19,
+        'mod_topic_attach_updated' => 20,
     ];
     public $log_type_select = [];
     public $log_disabled = false;