diff --git a/features.json b/features.json
index 8317871..534ef14 100644
--- a/features.json
+++ b/features.json
@@ -945,6 +945,7 @@
       "logo": "/images/watr.svg",
       "category": "Tools",
       "features": {
+        "acquireReleaseAtomics": "5.9.0",
         "bigInt": true,
         "branchHinting": true,
         "bulkMemory": true,