diff --git a/schemas/base.json b/schemas/base.json
index 4daa12c..66de964 100644
--- a/schemas/base.json
+++ b/schemas/base.json
@@ -43,6 +43,7 @@
           "required": [
             "type"
           ],
+          "additionalProperties": false
           "properties": {
             "type": {
               "enum": [
@@ -53,7 +54,23 @@
             "description": {
               "type": "string"
             },
-            "additionalProperties": false
+            "vars": {
+              "type": "object",
+              "title": "your collection of variables to be available to cuddle",
+              "patternProperties": {
+                "^.*$": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "object"
+                    }
+                  ]
+                }
+              },
+              "additionalProperties": false
+            },
           }
         }
       }