Update lib/Sabberworm/CSS/Property/Charset.php

Co-authored-by: Weston Ruter <westonruter@google.com>

Author: oliverklee

lib/Sabberworm/CSS/Property/Charset.php

@@ -19,6 +19,10 @@ class Charset implements AtRule {
 	 * @var int
 	 */
 	protected $iLineNo;
+
+	/**
+	 * @var array
+	 */
 	protected $aComment;
 
 	/**
@@ -84,4 +88,4 @@ public function getComments() {
 	public function setComments(array $aComments) {
 		$this->aComments = $aComments;
 	}
-}
+}