diff --git a/commander/commander-tests.ts b/commander/commander-tests.ts
index f6f3918f6a..78bd873782 100644
--- a/commander/commander-tests.ts
+++ b/commander/commander-tests.ts
@@ -79,6 +79,13 @@ program
         console.log('unknown option is allowed');
     });
 
+program
+  .version('0.0.1')
+  .arguments('<cmd> [env]')
+  .action(function (cmd, env) {
+     console.log(cmd, env);
+  });
+
 program.parse(process.argv);
 
 console.log('stuff');
diff --git a/commander/index.d.ts b/commander/index.d.ts
index e082fcebb2..15a3246710 100644
--- a/commander/index.d.ts
+++ b/commander/index.d.ts
@@ -74,6 +74,11 @@ declare namespace commander {
          */
         command(name:string, desc?:string, opts?: any):ICommand;
 
+        /**
+         * Set / get the arguments usage `str`.
+         */
+        arguments(str: string):ICommand;
+
         /**
          * Add an implicit `help [cmd]` subcommand
          * which invokes `--help` for the given command.