diff --git a/sty/usfm.sty b/sty/usfm.sty
index 4e8c420..e049e5f 100644
--- a/sty/usfm.sty
+++ b/sty/usfm.sty
@@ -2566,7 +2566,7 @@
 \Color 16711680
 #!\ColorName highcon blue
 \Underline
-#!\Attributes link-href
+#!\Attributes ?link-href ?link-id ?link-title
 
 \Marker pro
 \Endmarker pro*
diff --git a/sty/usfm_sb.sty b/sty/usfm_sb.sty
index 130a31f..4115983 100644
--- a/sty/usfm_sb.sty
+++ b/sty/usfm_sb.sty
@@ -2897,7 +2897,7 @@
 \Color 16711680
 #!\ColorName highcon blue
 \Underline
-#!\Attributes link-href
+#!\Attributes ?link-href ?link-id ?link-title
 
 \Marker pro
 \Endmarker pro*