feausilva
diff --git a/‎packages/angular/cli/commands/add-impl.ts‎
Lines changed: 1 addition & 0 deletions b/‎packages/angular/cli/commands/add-impl.ts‎
Lines changed: 1 addition & 0 deletions
diff --git a/‎packages/angular/cli/models/schematic-command.ts‎
Lines changed: 2 additions & 1 deletion b/‎packages/angular/cli/models/schematic-command.ts‎
Lines changed: 2 additions & 1 deletion
@@ -25,6 +25,7 @@ const npa = require('npm-package-arg');
 
 export class AddCommand extends SchematicCommand<AddCommandSchema> {
   readonly allowPrivateSchematics = true;
+  readonly allowAdditionalArgs = true;
   readonly packageManager = getPackageManager(this.workspace.root);
 
   async run(options: AddCommandSchema & Arguments) {
 
@@ -77,6 +77,7 @@ export abstract class SchematicCommand<
   T extends (BaseSchematicSchema & BaseCommandOptions),
 > extends Command<T> {
   readonly allowPrivateSchematics: boolean = false;
+  readonly allowAdditionalArgs: boolean = false;
   private _host = new NodeJsSyncHost();
   private _workspace: experimental.workspace.Workspace;
   private readonly _engine: Engine<FileSystemCollectionDesc, FileSystemSchematicDesc>;
@@ -438,7 +439,7 @@ export abstract class SchematicCommand<
     }
 
     // ng-add is special because we don't know all possible options at this point
-    if (args['--'] && schematicName !== 'ng-add') {
+    if (args['--'] && !this.allowAdditionalArgs) {
       args['--'].forEach(additional => {
         this.logger.fatal(`Unknown option: '${additional.split(/=/)[0]}'`);
       });