diff --git a/mix.exs b/mix.exs
index 7f76ebb..1062030 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,12 +5,13 @@ defmodule Tres.Mixfile do
     [
       app: :tres,
       version: "0.1.0",
-      elixir: "~> 1.5",
+      elixir: "~> 1.8",
       start_permanent: Mix.env() == :prod,
       escript: [main_module: Openflow.EnumGen, name: :enum_gen, path: "bin/enum_gen"],
       compilers: [:erlang] ++ Mix.compilers(),
       deps: deps(),
-      aliases: [test: "test --no-start", compile: ["escript.build"]]
+      aliases: [test: "test --no-start", compile: ["escript.build"]],
+      docs: docs()
     ]
   end
 
@@ -25,7 +26,77 @@ defmodule Tres.Mixfile do
       {:ranch, "~> 1.7.1"},
       {:eovsdb, github: "shun159/eovsdb", branch: "master"},
       {:jsone, github: "sile/jsone", tag: "1.4.6", override: true},
-      {:epcap, github: "msantos/epcap", branch: "master", only: :test}
+      {:epcap, github: "msantos/epcap", branch: "master", only: :test},
+      # Document
+      {:earmark, "~> 1.2.6", only: :dev, runtime: false},
+      {:ex_doc, "~> 0.19", only: :dev, runtime: false}
+    ]
+  end
+
+  defp docs do
+    [
+      groups_for_modules: groups_for_modules(),
+      formatters: ["html"],
+    ]
+  end
+
+  defp groups_for_modules do
+    [
+      "Actions": [
+        Openflow.Action.Output,
+        Openflow.Action.CopyTtlOut,
+        Openflow.Action.CopyTtlIn,
+        Openflow.Action.SetMplsTtl,
+        Openflow.Action.DecMplsTtl,
+        Openflow.Action.PushVlan,
+        Openflow.Action.PopVlan,
+        Openflow.Action.PushMpls,
+        Openflow.Action.PopMpls,
+        Openflow.Action.SetQueue,
+        Openflow.Action.Group,
+        Openflow.Action.SetNwTtl,
+        Openflow.Action.DecNwTtl,
+        Openflow.Action.SetField,
+        Openflow.Action.PushPbb,
+        Openflow.Action.PopPbb,
+        Openflow.Action.NxResubmit,
+        Openflow.Action.NxSetTunnel,
+        Openflow.Action.NxRegMove,
+        Openflow.Action.NxRegLoad,
+        Openflow.Action.NxNote,
+        Openflow.Action.NxSetTunnel64,
+        Openflow.Action.NxMultipath,
+        Openflow.Action.NxBundle,
+        Openflow.Action.NxBundleLoad,
+        Openflow.Action.NxResubmitTable,
+        Openflow.Action.NxOutputReg,
+        Openflow.Action.NxLearn,
+        Openflow.Action.NxExit,
+        Openflow.Action.NxDecTtl,
+        Openflow.Action.NxFinTimeout,
+        Openflow.Action.NxController,
+        Openflow.Action.NxDecTtlCntIds,
+        Openflow.Action.NxWriteMetadata,
+        Openflow.Action.NxPushMpls,
+        Openflow.Action.NxPopMpls,
+        Openflow.Action.NxStackPush,
+        Openflow.Action.NxStackPop,
+        Openflow.Action.NxSample,
+        Openflow.Action.NxOutputReg2,
+        Openflow.Action.NxRegLoad2,
+        Openflow.Action.NxConjunction,
+        Openflow.Action.NxConntrack,
+        Openflow.Action.NxNat,
+        Openflow.Action.NxController2,
+        Openflow.Action.NxSample2,
+        Openflow.Action.NxOutputTrunc,
+        Openflow.Action.NxGroup,
+        Openflow.Action.NxSample3,
+        Openflow.Action.NxClone,
+        Openflow.Action.NxCtClear,
+        Openflow.Action.NxResubmitTableCt,
+        Openflow.Action.NxLearn2
+      ]
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index de362d2..d7fe73c 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,11 +1,16 @@
 %{
   "binpp": {:git, "https://github.com/jtendo/binpp.git", "64bd68d215d1a6cd35871e7c134d7fe2e46214ea", [branch: "master"]},
+  "earmark": {:hex, :earmark, "1.2.6", "b6da42b3831458d3ecc57314dff3051b080b9b2be88c2e5aa41cd642a5b044ed", [:mix], [], "hexpm"},
   "eovsdb": {:git, "https://github.com/shun159/eovsdb.git", "1ff1572708d72fd25631c681f2102407903252a3", [branch: "master"]},
   "epcap": {:git, "https://github.com/msantos/epcap.git", "9566f0420a4dcf1292c1a1afd9339c35dbdfd041", [branch: "master"]},
+  "ex_doc": {:hex, :ex_doc, "0.19.3", "3c7b0f02851f5fc13b040e8e925051452e41248f685e40250d7e40b07b9f8c10", [:mix], [{:earmark, "~> 1.2", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.10", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
   "flow": {:hex, :flow, "0.12.0", "32c5a5f3ff6693e004b6c17a8c64dce2f8cdaf9564912d79427176013a586ab6", [], [{:gen_stage, "~> 0.12.0", [hex: :gen_stage, repo: "hexpm", optional: false]}], "hexpm"},
   "gen_stage": {:hex, :gen_stage, "0.12.2", "e0e347cbb1ceb5f4e68a526aec4d64b54ad721f0a8b30aa9d28e0ad749419cbb", [:mix], [], "hexpm"},
   "gen_state_machine": {:hex, :gen_state_machine, "2.0.1", "85efd5a0376929c3a4246dd943e17564a2908c7ddd7acd242d84594e785d83f8", [], [], "hexpm"},
   "jsone": {:git, "https://github.com/sile/jsone.git", "b23d312a5ed051ea7ad0989a9f2cb1a9c3f9a502", [tag: "1.4.6"]},
+  "makeup": {:hex, :makeup, "0.8.0", "9cf32aea71c7fe0a4b2e9246c2c4978f9070257e5c9ce6d4a28ec450a839b55f", [:mix], [{:nimble_parsec, "~> 0.5.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm"},
+  "makeup_elixir": {:hex, :makeup_elixir, "0.13.0", "be7a477997dcac2e48a9d695ec730b2d22418292675c75aa2d34ba0909dcdeda", [:mix], [{:makeup, "~> 0.8", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm"},
+  "nimble_parsec": {:hex, :nimble_parsec, "0.5.0", "90e2eca3d0266e5c53f8fbe0079694740b9c91b6747f2b7e3c5d21966bba8300", [:mix], [], "hexpm"},
   "pkt": {:git, "https://github.com/msantos/pkt.git", "ff0e9a7d28cdae941bce935602cd252cad1ea296", [branch: "master"]},
   "ranch": {:hex, :ranch, "1.7.1", "6b1fab51b49196860b733a49c07604465a47bdb78aa10c1c16a3d199f7f8c881", [:rebar3], [], "hexpm"},
   "uuid": {:git, "https://github.com/avtobiff/erlang-uuid.git", "585c2474afb4a597ae8c8bf6d21e5a9c73f18e0b", [tag: "v0.5.0"]},