add spec link
diff --git a/css/css-text/hanging-punctuation/hanging-punctuation-first-002.html b/css/css-text/hanging-punctuation/hanging-punctuation-first-002.html
index 74955d9..a2dd69f 100644
--- a/css/css-text/hanging-punctuation/hanging-punctuation-first-002.html
+++ b/css/css-text/hanging-punctuation/hanging-punctuation-first-002.html
@@ -4,6 +4,7 @@
<title>CSS Test: hanging-punctuation - first, U+3000</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<link rel="match" href="reference/hanging-punctuation-first-002-ref.html"/>
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#hanging-punctuation-property">
<meta name="assert" content="hanging-punctuation: first hangs U+300 IDEOGRAPHIC SPACE " >
<style>
.test {
