diff --git a/bin/cli.js b/bin/cli.js
index 5db7178..adf8ed8 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -10,17 +10,13 @@ program
   .name(name)
   .description(description)
   .version(version)
-  .usage('[options] <path>')
+  .argument('<path>', 'the partial/dependency path to resolve')
   .option('-c, --config <path>', 'location of a RequireJS config file for AMD')
   .option('-f, --filename <path>', 'file containing the dependency')
   .option('-d, --directory <path>', 'directory containing all files')
   .showHelpAfterError()
   .parse();
 
-if (program.args.length === 0) {
-  program.help();
-}
-
 const partial = program.args[0];
 const { filename, config } = program.opts();
 
diff --git a/test/cli.test.js b/test/cli.test.js
new file mode 100644
index 0000000..a351897
--- /dev/null
+++ b/test/cli.test.js
@@ -0,0 +1,21 @@
+/* eslint-env mocha */
+
+'use strict';
+
+const assert = require('assert').strict;
+const process = require('process');
+const { spawnSync } = require('child_process');
+const path = require('path');
+
+const cliPath = path.resolve(__dirname, '..', 'bin', 'cli.js');
+
+describe('lookup-amd CLI', () => {
+  it('prints error and exits 1 when path argument is missing', () => {
+    const result = spawnSync(process.execPath, [cliPath], {
+      encoding: 'utf8'
+    });
+
+    assert.equal(result.status, 1);
+    assert.match(result.stderr, /error: missing required argument 'path'/);
+  });
+});