diff --git a/grammars/css.cson b/grammars/css.cson
index 6256e55..19cd1c0 100644
--- a/grammars/css.cson
+++ b/grammars/css.cson
@@ -1498,7 +1498,7 @@
           (?:
             # Standard CSS
             accent-color|additive-symbols|align-content|align-items|align-self|all|animation|animation-delay|animation-direction|animation-duration
-            | animation-fill-mode|animation-iteration-count|animation-name|animation-play-state|animation-timing-function|aspect-ratio|backdrop-filter
+            | animation-fill-mode|animation-iteration-count|animation-name|animation-play-state|animation-timing-function|animation-timeline|animation-range|animation-range-start|animation-range-end|aspect-ratio|backdrop-filter
             | backface-visibility|background|background-attachment|background-blend-mode|background-clip|background-color|background-image
             | background-origin|background-position|background-position-[xy]|background-repeat|background-size|bleed|block-size|border
             | border-block-end|border-block-end-color|border-block-end-style|border-block-end-width|border-block-start|border-block-start-color