diff --git a/ext.php b/ext.php
new file mode 100644
index 0000000..dfe8845
--- /dev/null
+++ b/ext.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ * Extension enablement requirements.
+ *
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ */
+
+namespace rmcgirr83\topicdescription;
+
+class ext extends \phpbb\extension\base
+{
+	/**
+	 * Check whether the extension can be enabled.
+	 * The current phpBB and PHP version should meet or
+	 * exceed the minimum version required by this extension:
+	 *
+	 * @return bool|array
+	 * @access public
+	 */
+	public function is_enableable()
+	{
+		$enableable = $this->check_phpbb_version() && $this->check_php_version();
+
+		if (!$enableable)
+		{
+			$language = $this->container->get('language');
+			$language->add_lang('topicdescription_install', 'rmcgirr83/topicdescription');
+
+			return $language->lang('TOPICDESCRIPTION_NOT_ENABLEABLE');
+		}
+
+		return $enableable;
+	}
+
+	/**
+	 * Require phpBB 3.3.19 due to several security fixes in the phpBB software.
+	 *
+	 * @return bool
+	 */
+	protected function check_phpbb_version()
+	{
+		return phpbb_version_compare(PHPBB_VERSION, '3.3.19', '>=');
+	}
+
+	/**
+	 * Requires PHP 8.3.36 due to security fixes.
+	 *
+	 * @return bool
+	 */
+	protected function check_php_version()
+	{
+		return PHP_VERSION_ID >= 80336;
+	}
+}
diff --git a/language/en/topicdescription_install.php b/language/en/topicdescription_install.php
new file mode 100644
index 0000000..aa7c730
--- /dev/null
+++ b/language/en/topicdescription_install.php
@@ -0,0 +1,20 @@
+<?php
+/**
+ * Extension enablement requirements [English].
+ *
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ */
+
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+if (empty($lang) || !is_array($lang))
+{
+	$lang = array();
+}
+
+$lang = array_merge($lang, array(
+	'TOPICDESCRIPTION_NOT_ENABLEABLE' => 'Topic Description could not be enabled. It requires phpBB 3.3.19 or later and PHP 8.3.36 or later.',
+));