diff --git a/README.md b/README.md
index 8be3a2b..ee80d34 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,13 @@ After you are done, run `mix deps.get` in your shell to fetch and compile Mariae
 
 Important configuration, which depends on used charset for support unicode chars, see `:binary_as`
 in `Mariaex.start_link/1`
+
+### JSON library
+
+As default, [Poison](https://github.com/devinus/poison) is used for JSON library in mariaex to support JSON column.
+
+If you want to use another library, please set `config.exs` like below.
+
+```elixir
+config :mariaex, json_library: SomeLibrary
+```
diff --git a/lib/mariaex.ex b/lib/mariaex.ex
index 8ba66b9..9869f5a 100644
--- a/lib/mariaex.ex
+++ b/lib/mariaex.ex
@@ -66,7 +66,6 @@ defmodule Mariaex do
     in `GenServer.start_link/3`).
     * `:datetime` - How datetimes should be returned. `:structs` for Elixir v1.3
       calendar types or `:tuples` for the backwards compatible tuples
-    * `:json_library` - JSON Library to parse json column. (default: `Poison`)
 
   ## Function signatures
 
diff --git a/lib/mariaex/protocol.ex b/lib/mariaex/protocol.ex
index 6a42dc5..50619ec 100644
--- a/lib/mariaex/protocol.ex
+++ b/lib/mariaex/protocol.ex
@@ -77,7 +77,7 @@ defmodule Mariaex.Protocol do
     connect_opts = [host, opts[:port], opts[:socket_options], opts[:timeout]]
     binary_as    = opts[:binary_as] || :field_type_var_string
     datetime     = opts[:datetime] || :structs
-    json_library = opts[:json_library] || Poison
+    json_library = Application.get_env(:mariaex, :json_library, Poison)
 
     case apply(sock_mod, :connect, connect_opts) do
       {:ok, sock} ->