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node_modules/postcss-loader/node_modules/schema-utils/README.md

@@ -27,7 +27,7 @@ npm i schema-utils
 
 ### `validateOptions`
 
-**schema.json**
+**`schema.json`**
 ```js
 {
   "type": "object",
@@ -38,6 +38,25 @@ npm i schema-utils
 }
 ```
 
+#### Error Messages (Custom)
+
+**`schema.json`**
+```js
+{
+  "type": "object",
+  "properties": {
+    "option": {
+      "type": [ "boolean" ]
+    }
+  },
+  // Overrides the default err.message for option
+  "errorMessage": {
+    "option": "should be {Boolean} (https:/github.com/org/repo#anchor)"
+  }
+  "additionalProperties": false
+}
+```
+
 ```js
 import schema from 'path/to/schema.json'
 import validateOptions from 'schema-utils'