diff --git a/lib/index.js b/lib/index.js
index 83887a6..356a21a 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -140,6 +140,11 @@ module.exports = class CLI extends EventEmitter {
       help: 'Where to create your project'
     })
 
+    s.addArgument(['--yarn', '-y'], {
+      help: 'Use yarn rather than npm to install dependencies',
+      nargs: 0
+    })
+
     s.addArgument(['--template', '--tpl', '-t'], {
       help: 'The template to use for your project. See "spike tpl" for more.'
     })
diff --git a/lib/new.js b/lib/new.js
index d9bbd60..e7ddaa7 100644
--- a/lib/new.js
+++ b/lib/new.js
@@ -14,7 +14,8 @@ module.exports = function (Spike, args) {
     emitter: emitter,
     locals: args.overrides,
     template: args.template,
-    inquirer: inquirer.prompt.bind(inquirer)
+    inquirer: inquirer.prompt.bind(inquirer),
+    tool: args.yarn ? 'yarn' : undefined
   }))
 
   return emitter