diff --git a/lib/sidekiq/cli.rb b/lib/sidekiq/cli.rb
index 5445a8c3..8f4e77be 100644
--- a/lib/sidekiq/cli.rb
+++ b/lib/sidekiq/cli.rb
@@ -192,6 +192,10 @@ module Sidekiq
           opts[:require] = arg
         end
 
+        o.on '-i', '--index INT', "unique process index on this machine" do |arg|
+          opts[:index] = Integer(arg)
+        end
+
         o.on '-c', '--concurrency INT', "processor threads to use" do |arg|
           opts[:concurrency] = Integer(arg)
         end
diff --git a/test/test_cli.rb b/test/test_cli.rb
index e4eaf9aa..1738be03 100644
--- a/test/test_cli.rb
+++ b/test/test_cli.rb
@@ -40,6 +40,11 @@ class TestCli < MiniTest::Unit::TestCase
       assert_equal ['foo'], Sidekiq.options[:queues]
     end
 
+    it 'accepts a process index' do
+      @cli.parse(['sidekiq', '-i', '7', '-r', './test/fake_env.rb'])
+      assert_equal 7, Sidekiq.options[:index]
+    end
+
     it 'sets strictly ordered queues if weights are not present' do
       @cli.parse(['sidekiq', '-q', 'foo,bar', '-r', './test/fake_env.rb'])
       assert_equal true, !!Sidekiq.options[:strict]