diff --git a/checkin_notes b/checkin_notes
index 206c9c69d6..42720e60bf 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -11241,3 +11241,9 @@ David  17 Nov 2007
             forum_email.inc
         user/
             forum_user_posts.php
+
+David  18 Nov 2007
+    - user web: update post.modified when edit post (fixes #491)
+
+    html/user/
+        forum_edit.php
diff --git a/html/user/forum_edit.php b/html/user/forum_edit.php
index d1a505464b..0c49fa16da 100644
--- a/html/user/forum_edit.php
+++ b/html/user/forum_edit.php
@@ -47,7 +47,8 @@ if (post_str('submit',true) && (!$preview)) {
     }
     $content = substr($content, 0, 64000);
     $content = BoincDb::escape_string($content);
-    $post->update("signature=$add_signature, content='$content'");
+    $now = time();
+    $post->update("signature=$add_signature, content='$content', modified=$now");
     
     // If this post belongs to the creator of the thread and is at top-level 
     // (ie. not a response to another post)