diff --git a/css/properties.json b/css/properties.json
index 3877e9c7..47aaf1f7 100644
--- a/css/properties.json
+++ b/css/properties.json
@@ -3988,7 +3988,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/break-inside"
   },
   "caption-side": {
-    "syntax": "top | bottom | block-start | block-end | inline-start | inline-end",
+    "syntax": "top | bottom",
     "media": "visual",
     "inherited": true,
     "animationType": "discrete",