diff --git a/schemas/api-config/field.json b/schemas/api-config/field.json
index 64fa2ff..a97a5f5 100644
--- a/schemas/api-config/field.json
+++ b/schemas/api-config/field.json
@@ -58,6 +58,16 @@
                 }
             ]
         },
+        "validator": {
+            "type": "object",
+            "description": "field validator",
+            "properties": {
+                "eval": {
+                    "type": "string",
+                    "description": "javascript validator which failes if evaluates to false or string as error message, with following variables: $this, $parent, $stack, $auth, context"
+                }
+            }
+        },
         "meta": {
             "type": "object",
             "description": "meta object of field",
@@ -79,6 +89,7 @@
                         "select",
                         "selectArray",
                         "date",
+                        "datetime",
                         "file",
                         "image",
                         "jsonField",
@@ -182,7 +193,7 @@
                             "properties": {
                                 "eval": {
                                     "type": "string",
-                                    "description": "js code with $, $this, $parent and $stack variables"
+                                    "description": "javascript code which hides field widget if evaluates to false with $, $this, $parent and $stack variables"
                                 }
                             }
                         }