diff --git a/schemas/legacy.json b/schemas/legacy.json
index 5e9fe82..73d513c 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -90,6 +90,18 @@
                 "MaxReading": {
                     "$ref": "#/definitions/Types/MaxReading"
                 },
+                "MaxValue": {
+                    "$ref": "#/definitions/Types/MaxValue"
+                },
+                "Units": {
+                    "$ref": "#/definitions/Types/Units"
+                },
+                "MinReading": {
+                    "$ref": "#/definitions/Types/MinReading"
+                },
+                "MinValue": {
+                    "$ref": "#/definitions/Types/MinValue"
+                },
                 "Name": {
                     "$ref": "#/definitions/Types/Name"
                 },
@@ -407,6 +419,18 @@
             "MaxReading": {
                 "type": "number"
             },
+            "MaxValue": {
+                "type": "number"
+            },
+            "Units": {
+                "type": "string"
+            },
+            "MinReading": {
+                "type": "number"
+            },
+            "MinValue": {
+                "type": "number"
+            },
             "Name": {
                 "type": "string"
             },