diff --git a/after/syntax/css/nav-1.vim b/after/syntax/css/nav-1.vim
index 4877c16..31c4c86 100644
--- a/after/syntax/css/nav-1.vim
+++ b/after/syntax/css/nav-1.vim
@@ -1,2 +1,2 @@
-syn match cssFontProp contained "\<spatial-navigation-\(action\|contain\)\>"
+syn match cssFontProp contained "\<spatial-navigation-\(action\|contain\|function\)\>"
 syn keyword cssFontAttr contained focus
diff --git a/test/test.css b/test/test.css
index 1acd2cc..6644ea6 100644
--- a/test/test.css
+++ b/test/test.css
@@ -602,6 +602,7 @@ mask {
 .nav-1 {
   spatial-navigation-contain: auto;
   spatial-navigation-action: auto;
+  spatial-navigation-function: auto;
   display: focus;
 }