diff --git a/after/syntax/css/images-3.vim b/after/syntax/css/images-3.vim
index c10d823..fe377a4 100644
--- a/after/syntax/css/images-3.vim
+++ b/after/syntax/css/images-3.vim
@@ -1,6 +1,6 @@
 syn match cssFontProp contained "\<object-\(fit\|position\)\>"
 syn match cssFontProp contained "\<image-orientation\>"
-syn keyword cssFontAttr contained snap
+syn keyword cssFontAttr contained snap flip
 syn match cssFontAttr contained "\<scale-down\>"
 syn match cssFontAttr contained "\<from-image\>"
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(repeating-\(linear\|radial\)-gradient\)\s*(" end=")" oneline keepend
diff --git a/test/test.css b/test/test.css
index 6cd34b8..221c259 100644
--- a/test/test.css
+++ b/test/test.css
@@ -427,6 +427,7 @@ template {
   object-position: auto;
   image-orientation: auto;
   display: snap;
+  display: flip;
   display: scale-down;
   display: from-image;
   display: repeating-linear-gradient(to bottom, yellow, blue);