diff --git a/data/pc/common/features.json b/data/pc/common/features.json
index 370b00980..6770e062b 100644
--- a/data/pc/common/features.json
+++ b/data/pc/common/features.json
@@ -55,6 +55,22 @@
       "latest"
     ]
   },
+  {
+    "name": "clientCommandUsesStringMapper",
+    "description": "client_command packet uses string mappings instead of a numeric actionId",
+    "versions": [
+      "26.1",
+      "latest"
+    ]
+  },
+  {
+    "name": "useEntityUsesStringMapper",
+    "description": "use_entity packet uses string mappings instead of a numeric hand",
+    "versions": [
+      "26.1",
+      "latest"
+    ]
+  },
   {
     "name": "attributeSnakeCase",
     "description": "entity attributes are in snake case",