diff --git a/lib/openflow/actions/nx_bundle.ex b/lib/openflow/actions/nx_bundle.ex
index 04190a9..0b93371 100644
--- a/lib/openflow/actions/nx_bundle.ex
+++ b/lib/openflow/actions/nx_bundle.ex
@@ -14,6 +14,32 @@ defmodule Openflow.Action.NxBundle do
   alias __MODULE__
   alias Openflow.Action.Experimenter
 
+  @type algorithm :: :active_backup | :highest_random_weight
+  @type hash_field ::
+          :eth_src
+          | :symmetric_l4
+          | :symmetric_l3l4
+          | :symmetric_l3l4_udp
+          | :nw_src
+          | :nw_dst
+
+  @type t :: %NxBundle{
+          algorithm: algorithm(),
+          hash_field: hash_field(),
+          basis: non_neg_integer(),
+          slave_type: :nx_in_port,
+          n_slaves: non_neg_integer(),
+          slaves: [pos_integer()]
+        }
+
+  @spec new(
+          algorithm: algorithm(),
+          hash_field: hash_field(),
+          basis: non_neg_integer(),
+          slave_type: :nx_in_port,
+          n_slaves: non_neg_integer(),
+          slaves: [pos_integer()]
+        ) :: t()
   def new(options \\ []) do
     slaves = options[:slaves] || []
 
diff --git a/lib/openflow/actions/nx_bundle_load.ex b/lib/openflow/actions/nx_bundle_load.ex
index 7548329..743689c 100644
--- a/lib/openflow/actions/nx_bundle_load.ex
+++ b/lib/openflow/actions/nx_bundle_load.ex
@@ -19,6 +19,38 @@ defmodule Openflow.Action.NxBundleLoad do
   alias __MODULE__
   alias Openflow.Action.Experimenter
 
+  @type algorithm :: :active_backup | :highest_random_weight
+  @type hash_field ::
+          :eth_src
+          | :symmetric_l4
+          | :symmetric_l3l4
+          | :symmetric_l3l4_udp
+          | :nw_src
+          | :nw_dst
+
+  @type t :: %NxBundleLoad{
+          algorithm: algorithm(),
+          hash_field: hash_field(),
+          basis: non_neg_integer(),
+          slave_type: :nx_in_port,
+          n_slaves: non_neg_integer(),
+          slaves: [pos_integer()],
+          offset: non_neg_integer(),
+          n_bits: pos_integer(),
+          dst_field: atom()
+        }
+
+  @spec new(
+          algorithm: algorithm(),
+          hash_field: hash_field(),
+          basis: non_neg_integer(),
+          slave_type: :nx_in_port,
+          n_slaves: non_neg_integer(),
+          slaves: [pos_integer()],
+          offset: non_neg_integer(),
+          n_bits: pos_integer(),
+          dst_field: atom()
+        ) :: t()
   def new(options \\ []) do
     dst_field = options[:dst_field] || raise "dst_field must be specified"
     default_n_bits = Openflow.Match.Field.n_bits_of(dst_field)
@@ -32,7 +64,7 @@ defmodule Openflow.Action.NxBundleLoad do
       slaves: slaves,
       offset: options[:offset] || 0,
       n_bits: options[:n_bits] || default_n_bits,
-      dst_field: options[:dst_field]
+      dst_field: dst_field
     }
   end
 
diff --git a/lib/openflow/actions/nx_flow_spec_load.ex b/lib/openflow/actions/nx_flow_spec_load.ex
index dcdbf86..bd7a849 100644
--- a/lib/openflow/actions/nx_flow_spec_load.ex
+++ b/lib/openflow/actions/nx_flow_spec_load.ex
@@ -13,12 +13,28 @@ defmodule Openflow.Action.NxFlowSpecLoad do
 
   alias __MODULE__
 
+  @type t :: %NxFlowSpecLoad{
+          src: atom(),
+          dst: atom(),
+          n_bits: non_neg_integer(),
+          src_offset: non_neg_integer(),
+          dst_offset: non_neg_integer()
+        }
+
+  @spec new(
+          src: atom(),
+          dst: atom(),
+          n_bits: non_neg_integer(),
+          src_offset: non_neg_integer(),
+          dst_offset: non_neg_integer()
+        ) :: t()
   def new(options) do
-    dst = options[:dst]
+    dst = options[:dst] || raise(":dst must be specified")
+    src = options[:src] || raise(":src must be specified")
     n_bits = options[:n_bits] || Openflow.Match.Field.n_bits_of(dst)
 
     %NxFlowSpecLoad{
-      src: options[:src],
+      src: src,
       dst: dst,
       n_bits: n_bits,
       src_offset: options[:src_offset] || 0,
diff --git a/test/ofp_action_test.exs b/test/ofp_action_test.exs
index 22579b9..8d6cd71 100644
--- a/test/ofp_action_test.exs
+++ b/test/ofp_action_test.exs
@@ -178,6 +178,8 @@ defmodule OfpActionTest do
       bundle =
         Openflow.Action.NxBundle.new(
           algorithm: :highest_random_weight,
+          hash_field: :eth_src,
+          basis: 0,
           slaves: [4, 8]
         )
 
@@ -185,6 +187,15 @@ defmodule OfpActionTest do
       assert actions_bin == packet
       assert actions == [bundle]
     end
+
+    test "with no option" do
+      bundle = Openflow.Action.NxBundle.new()
+      assert bundle.algorithm == :active_backup
+      assert bundle.hash_field == :eth_src
+      assert bundle.basis == 0
+      assert bundle.n_slaves == 0
+      assert bundle.slaves == []
+    end
   end
 
   describe "Openflow.Action.NxBundleLoad" do
@@ -196,7 +207,10 @@ defmodule OfpActionTest do
       bundle_load =
         Openflow.Action.NxBundleLoad.new(
           algorithm: :highest_random_weight,
+          hash_field: :eth_src,
+          basis: 0,
           slaves: [4, 8],
+          offset: 0,
           dst_field: :reg0
         )
 
@@ -769,6 +783,8 @@ defmodule OfpActionTest do
         Openflow.Action.NxFlowSpecMatch.new(
           src: :in_port,
           dst: :reg0,
+          src_offset: 0,
+          dst_offset: 0,
           n_bits: 16
         )
 
@@ -799,6 +815,49 @@ defmodule OfpActionTest do
     end
   end
 
+  describe "Openflow.Action.NxFlowSpecLoad" do
+    test "with src = 0xdeadbeef and dst: :reg0" do
+      flow_spec = Openflow.Action.NxFlowSpecLoad.new(src: 0xDEADBEEF, dst: :reg0)
+
+      flow_spec
+      |> Openflow.Action.NxFlowSpec.to_binary()
+      |> Openflow.Action.NxFlowSpec.read()
+      |> Enum.at(0)
+      |> Kernel.==(flow_spec)
+      |> assert()
+    end
+
+    test "with src = :in_port and dst: :reg0" do
+      flow_spec =
+        Openflow.Action.NxFlowSpecLoad.new(
+          src: :in_port,
+          dst: :reg0,
+          src_offset: 0,
+          dst_offset: 0,
+          n_bits: 16
+        )
+
+      flow_spec
+      |> Openflow.Action.NxFlowSpec.to_binary()
+      |> Openflow.Action.NxFlowSpec.read()
+      |> Enum.at(0)
+      |> Kernel.==(flow_spec)
+      |> assert()
+    end
+
+    test "with no dst option" do
+      assert_raise RuntimeError, ":dst must be specified", fn ->
+        Openflow.Action.NxFlowSpecLoad.new(src: :in_port)
+      end
+    end
+
+    test "with no src option" do
+      assert_raise RuntimeError, ":src must be specified", fn ->
+        Openflow.Action.NxFlowSpecLoad.new(dst: :reg0)
+      end
+    end
+  end
+
   describe "Openflow.Action.NxMultipath" do
     test "with multipath" do
       test_file = "test/packet_data/nx_multipath.raw"