docs: updated

README.md

@@ -980,11 +980,13 @@ module.exports = {
 
 ##### `namedExport`
 
-Type: `Boolean`
+Type: `Boolean|Function`
 Default: `false`
 
 Enables/disables ES modules named export for locals.
 
+###### `Boolean`
+
 > ⚠ Names of locals are converted to camelcase, i.e. the `exportLocalsConvention` option has `camelCaseOnly` value by default.
 
 > ⚠ It is not allowed to use JavaScript reserved words in css class names.
@@ -1031,6 +1033,32 @@ module.exports = {
 };
 ```
 
+###### `Function`
+
+If `namedExport` function, `exportLocalsConvention` option is ignored;
+
+**webpack.config.js**
+
+```js
+module.exports = {
+  module: {
+    rules: [
+      {
+        test: /\.css$/i,
+        loader: "css-loader",
+        options: {
+          modules: {
+            namedExport: function (name) {
+              return name.replace(/-/g, "_");
+            },
+          },
+        },
+      },
+    ],
+  },
+};
+```
+
 ##### `exportGlobals`
 
 Type: `Boolean`