diff --git a/spec/unit/lib/puppet/type/docker_network_spec.rb b/spec/unit/lib/puppet/type/docker_network_spec.rb
index ed8444b..ed99582 100644
--- a/spec/unit/lib/puppet/type/docker_network_spec.rb
+++ b/spec/unit/lib/puppet/type/docker_network_spec.rb
@@ -1,38 +1,39 @@
 require 'spec_helper'
 
 network = Puppet::Type.type(:docker_network)
 
 describe network do
   let :params do
     [
       :name,
       :provider,
       :subnet,
       :gateway,
       :ip_range,
       :aux_address,
       :options,
+      :additional_flags,
     ]
   end
 
   let :properties do
     [
       :ensure,
       :driver,
       :ipam_driver,
       :id,
     ]
   end
 
   it 'has expected properties' do
     properties.each do |property|
       expect(network.properties.map(&:name)).to be_include(property)
     end
   end
 
   it 'has expected parameters' do
     params.each do |param|
       expect(network.parameters).to be_include(param)
     end
   end
 end