diff --git a/schema/schema.json b/schema/schema.json
index c9cf9b1ba..16be027c0 100644
--- a/schema/schema.json
+++ b/schema/schema.json
@@ -24,6 +24,17 @@
                 }
             }
         },
+        "annotations": {
+            "id": "https://opencontainers.org/schema/bundle/linux/sysctl",
+            "oneOf": [
+                {
+                    "$ref": "defs.json#/definitions/mapStringString"
+                },
+                {
+                    "type": "null"
+                }
+            ]
+        },
         "hostname": {
             "id": "https://opencontainers.org/schema/bundle/hostname",
             "type": "string"