diff --git a/editor/svgcanvas.js b/editor/svgcanvas.js
index 5c367445..b4b9cee5 100644
--- a/editor/svgcanvas.js
+++ b/editor/svgcanvas.js
@@ -135,6 +135,7 @@ var isOpera = !!window.opera,
 	"annotation-xml": ["encoding"],
 	"maction": ["actiontype", "other", "selection"],
 	"math": ["class", "id", "display", "xmlns"],
+	"menclose": ["notation"],
 	"merror": [],
 	"mfrac": ["linethickness"],
 	"mi": ["mathvariant"],