diff --git a/after/syntax/css/ruby-1.vim b/after/syntax/css/ruby-1.vim
index 115530b..7cc9285 100644
--- a/after/syntax/css/ruby-1.vim
+++ b/after/syntax/css/ruby-1.vim
@@ -1,3 +1,4 @@
 syn match cssFontProp contained "\<ruby-\(position\|merge\|align\|overhang\)"
+syn keyword cssFontAttr contained merge
 syn match cssFontAttr contained "\<ruby-\(base\|text\)-container\>"
 syn match cssFontAttr contained "\<inter-character\>"
diff --git a/test/test.css b/test/test.css
index 6e1f986..94b0c05 100644
--- a/test/test.css
+++ b/test/test.css
@@ -752,6 +752,7 @@ mask {
 	ruby-overhang: auto;
 	display: ruby-base-container;
 	display: ruby-text-container;
+	display: merge;
 	display: inter-character;
 }