diff --git a/modules/system/ServiceProvider.php b/modules/system/ServiceProvider.php
index 2c85ff576a..8708a137c0 100644
--- a/modules/system/ServiceProvider.php
+++ b/modules/system/ServiceProvider.php
@@ -213,6 +213,7 @@ protected function registerMarkupTags()
                 'transchoice'    => ['Lang', 'choice'],
                 'md'             => ['Markdown', 'parse'],
                 'md_safe'        => ['Markdown', 'parseSafe'],
+                'md_line'        => ['Markdown', 'parseLine'],
                 'time_since'     => ['System\Helpers\DateTime', 'timeSince'],
                 'time_tense'     => ['System\Helpers\DateTime', 'timeTense'],
             ]);