I just added a piece of code to views/item/view.html.php.After these three lines: if ($item->metakey) { $document->setMetadata('keywords', $item->metakey); }I added these 11 lines: else if (isset($item->tags) && count($item->tags)) { $tags_string = ""; foreach ($item->tags as $this_tag) { if (strlen($tags_string)) $tags_string .= ", "; $tags_string .= $this_tag->name; } $document->setMetadata('keywords', $tags_string); }What this accomplishes is, if you don't define any keywords for an article, the article tags become meta keywords instead.