diff --git a/after/syntax/css/ruby-1.vim b/after/syntax/css/ruby-1.vim
index 52f4dd5..115530b 100644
--- a/after/syntax/css/ruby-1.vim
+++ b/after/syntax/css/ruby-1.vim
@@ -1,4 +1,3 @@
-" TODO: create cssRubyProp group and cssRubyAttr group
-syn match cssFontProp contained "\<ruby-\(position\|merge\|align\)"
+syn match cssFontProp contained "\<ruby-\(position\|merge\|align\|overhang\)"
 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 21f3b75..c7802a1 100644
--- a/test/test.css
+++ b/test/test.css
@@ -725,6 +725,7 @@ mask {
 	ruby-position: auto;
 	ruby-merge: auto;
 	ruby-align: auto;
+	ruby-overhang: auto;
 	display: ruby-base-container;
 	display: ruby-text-container;
 	display: inter-character;