diff --git a/types/duplicate-package-checker-webpack-plugin/duplicate-package-checker-webpack-plugin-tests.ts b/types/duplicate-package-checker-webpack-plugin/duplicate-package-checker-webpack-plugin-tests.ts
index 0552f0e7c4..27eb651287 100644
--- a/types/duplicate-package-checker-webpack-plugin/duplicate-package-checker-webpack-plugin-tests.ts
+++ b/types/duplicate-package-checker-webpack-plugin/duplicate-package-checker-webpack-plugin-tests.ts
@@ -18,7 +18,12 @@ const c: webpack.Configuration = {
     plugins: [
         new DuplicatePackageCheckerWebpackPlugin({
             verbose: true,
-            emitError: true
+            emitError: true,
+            showHelp: false,
+            strict: false,
+            exclude(instance) {
+                return instance.name === "fbjs";
+            }
         })
     ]
 };
diff --git a/types/duplicate-package-checker-webpack-plugin/index.d.ts b/types/duplicate-package-checker-webpack-plugin/index.d.ts
index 1eff56e9d5..cadb922c1a 100644
--- a/types/duplicate-package-checker-webpack-plugin/index.d.ts
+++ b/types/duplicate-package-checker-webpack-plugin/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for duplicate-package-checker-webpack-plugin 1.2
+// Type definitions for duplicate-package-checker-webpack-plugin 2.1
 // Project: https://github.com/darrenscerri/duplicate-package-checker-webpack-plugin#readme
 // Definitions by: Matt Traynham <https://github.com/mtraynham>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -13,10 +13,36 @@ declare class DuplicatePackageCheckerWebpackPlugin extends Plugin {
 }
 
 declare namespace DuplicatePackageCheckerWebpackPlugin {
+    /** The properties of the instance of a package */
+    interface PackageInstanceProperties {
+        /** The name of the package */
+        name: string;
+        /** The version of the package */
+        version: string;
+        /** Absolute path to the package */
+        path: string;
+        /** Absolute path to the module that requested the package */
+        issuer?: string;
+    }
+
+    /** The configurable options for the plugin */
     interface Options {
-        // Also show module that is requiring each duplicate package
+        /** Also show module that is requiring each duplicate package (default: false) */
         verbose?: boolean;
-        // Emit errors instead of warnings
+        /** Emit errors instead of warnings (default: false) */
         emitError?: boolean;
+        /** Show help message if duplicate packages are found (default: true) */
+        showHelp?: boolean;
+        /** Warn also if major versions differ (default: true) */
+        strict?: boolean;
+
+        /**
+         * Exclude instances of packages from the results.
+         * If all instances of a package are excluded, or all instances except one,
+         * then the package is no longer considered duplicated and won't be emitted as a warning/error.
+         * @param instance The instance of a package being evaluated for exclusion.
+         * @returns true to exclude the instance, false otherwise
+         */
+        exclude?: (instance: PackageInstanceProperties) => boolean;
     }
 }