diff --git a/NodeTypes.Schema.json b/NodeTypes.Schema.json
index 89988fe..532ff0a 100644
--- a/NodeTypes.Schema.json
+++ b/NodeTypes.Schema.json
@@ -849,11 +849,17 @@
             }
         },
         "simpleValidator": {
+            "$comment": "This is the base validator definition for all validators. It is extended by the actual validators below.",
             "type": [
                 "object",
                 "null"
             ],
-            "additionalProperties": false
+            "properties": {
+                "validationErrorMessage": {
+                    "type": "string",
+                    "description": "The custom error message to be shown if the validation fails. Neos 8.0+"
+                }
+            }
         },
         "validation": {
             "type": [
@@ -869,24 +875,20 @@
             },
             "properties": {
                 "Neos.Neos/Validation/BooleanValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "expectedValue": {
                             "type": "boolean"
                         }
                     }
                 },
                 "Neos.Neos/Validation/DateTimeValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "locale": {
                             "type": "string"
                         },
@@ -912,12 +914,10 @@
                     }
                 },
                 "Neos.Neos/Validation/DateTimeRangeValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "earliestDate": {
                             "type": "string"
                         },
@@ -927,12 +927,10 @@
                     }
                 },
                 "Neos.Neos/Validation/EmailAddressValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "strict": {
                             "type": "boolean"
                         },
@@ -942,24 +940,38 @@
                     }
                 },
                 "Neos.Neos/Validation/FloatValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/IntegerValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/LabelValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/LocaleIdentifierValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/NumberValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "locale": {
                             "type": "string"
                         },
@@ -985,12 +997,10 @@
                     }
                 },
                 "Neos.Neos/Validation/NumberRangeValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "minimum": {
                             "type": "integer",
                             "minimum": 0
@@ -1002,33 +1012,34 @@
                     }
                 },
                 "Neos.Neos/Validation/NotEmptyValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/RegularExpressionValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "regularExpression": {
                             "type": "string"
-                        },
-                        "validationErrorMessage": {
-                            "type": "string"
                         }
                     }
                 },
                 "Neos.Neos/Validation/StringValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/StringLengthValidator": {
-                    "type": [
-                        "object",
-                        "null"
-                    ],
+                    "$ref": "#/definitions/simpleValidator",
                     "additionalProperties": false,
                     "properties": {
+                        "validationErrorMessage": true,
                         "minimum": {
                             "type": "integer",
                             "minimum": 0
@@ -1043,10 +1054,18 @@
                     }
                 },
                 "Neos.Neos/Validation/TextValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 },
                 "Neos.Neos/Validation/UuidValidator": {
-                    "$ref": "#/definitions/simpleValidator"
+                    "$ref": "#/definitions/simpleValidator",
+                    "additionalProperties": false,
+                    "properties": {
+                        "validationErrorMessage": true
+                    }
                 }
             }
         },
diff --git a/examples/NodeTypes.Validators.yaml b/examples/NodeTypes.Validators.yaml
index 614a1f8..1f4e408 100644
--- a/examples/NodeTypes.Validators.yaml
+++ b/examples/NodeTypes.Validators.yaml
@@ -10,40 +10,53 @@ My.Vendor:Content.Validators:
       validation:
         My.Custom/Validator:
           myCustomProperty: true
-
         Neos.Neos/Validation/BooleanValidator:
           expectedValue: false
+          validationErrorMessage: 'Please enter a boolean'
         Neos.Neos/Validation/DateTimeValidator:
           locale: en
           strictMode: false
           formatLength: default
           formatType: date
+          validationErrorMessage: 'Please enter a valid datetime'
         Neos.Neos/Validation/DateTimeRangeValidator:
           earliestDate: 1.1.2000
           latestDate: 2.1.2000
+          validationErrorMessage: 'Please enter a valid datetime in the range of x and y'
         Neos.Neos/Validation/EmailAddressValidator:
           checkDns: false
           strict: false
-        Neos.Neos/Validation/FloatValidator: { }
-        Neos.Neos/Validation/IntegerValidator: { }
-        Neos.Neos/Validation/LabelValidator: { }
-        Neos.Neos/Validation/LocaleIdentifierValidator: { }
-        Neos.Neos/Validation/NotEmptyValidator: { }
+          validationErrorMessage: 'Please enter a valid email address'
+        Neos.Neos/Validation/FloatValidator:
+          validationErrorMessage: 'Please enter a valid float'
+        Neos.Neos/Validation/IntegerValidator:
+          validationErrorMessage: 'Please enter a valid integer'
+        Neos.Neos/Validation/LabelValidator:
+          validationErrorMessage: 'Please enter a valid label'
+        Neos.Neos/Validation/LocaleIdentifierValidator:
+          validationErrorMessage: 'Please enter a valid locale'
+        Neos.Neos/Validation/NotEmptyValidator:
+            validationErrorMessage: 'Please enter a value'
         Neos.Neos/Validation/NumberValidator:
           locale: en
           strictMode: false
           formatLength: default
           formatType: decimal
+          validationErrorMessage: 'Please enter a number'
         Neos.Neos/Validation/NumberRangeValidator:
           minimum: 0
           maximum: 2
         Neos.Neos/Validation/RegularExpressionValidator:
           regularExpression: '/^[a-z0-9\-]+$/i'
           validationErrorMessage: 'Please enter only lowercase letters, numbers or minus'
-        Neos.Neos/Validation/StringValidator: {}
+        Neos.Neos/Validation/StringValidator:
+          validationErrorMessage: 'Please enter a valid string'
         Neos.Neos/Validation/StringLengthValidator:
           minimum: 0
           maximum: 1
           ignoreHtml: false
-        Neos.Neos/Validation/TextValidator: { }
-        Neos.Neos/Validation/UuidValidator: { }
+          validationErrorMessage: 'Please enter a valid string between x and y characters'
+        Neos.Neos/Validation/TextValidator:
+          validationErrorMessage: 'Please enter a valid text'
+        Neos.Neos/Validation/UuidValidator:
+          validationErrorMessage: 'Please enter a valid uuid'