diff --git a/lib/bamboo/attachment.ex b/lib/bamboo/attachment.ex
index ab82f2cc..6d618379 100644
--- a/lib/bamboo/attachment.ex
+++ b/lib/bamboo/attachment.ex
@@ -2,14 +2,20 @@ defmodule Bamboo.Attachment do
   @moduledoc """
   """
 
-  defstruct filename: nil, content_type: nil, path: nil, data: nil, content_id: nil
+  defstruct filename: nil,
+            content_type: nil,
+            path: nil,
+            data: nil,
+            content_id: nil,
+            content_disposition: nil
 
   @type t :: %__MODULE__{
           path: nil | String.t(),
           filename: nil | String.t(),
           content_type: nil | String.t(),
           data: nil | binary(),
-          content_id: nil | String.t()
+          content_id: nil | String.t(),
+          content_disposition: nil | String.t()
         }
 
   @doc ~S"""
@@ -26,12 +32,12 @@ defmodule Bamboo.Attachment do
 
       Bamboo.Attachment.new("/path/to/attachment.png")
       Bamboo.Attachment.new("/path/to/attachment.png", filename: "image.png")
-      Bamboo.Attachment.new("/path/to/attachment.png", filename: "image.png", content_type: "image/png", content_id: "12387432")
+      Bamboo.Attachment.new("/path/to/attachment.png", filename: "image.png", content_type: "image/png", content_id: "12387432", content_disposition: "attachment")
       Bamboo.Attachment.new(params["file"]) # Where params["file"] is a %Plug.Upload
 
       email
       |> put_html_layout({LayoutView, "email.html"})
-      |> put_attachment(%Bamboo.Attachment{content_type: "image/png", filename: "logo.png", data: "content", content_id: "2343333333"})
+      |> put_attachment(%Bamboo.Attachment{content_type: "image/png", filename: "logo.png", data: "content", content_id: "2343333333", content_disposition: "attachment"})
   """
   def new(path, opts \\ [])
 
@@ -44,6 +50,7 @@ defmodule Bamboo.Attachment do
     filename = opts[:filename] || Path.basename(path)
     content_type = opts[:content_type] || determine_content_type(path)
     content_id = opts[:content_id]
+    content_disposition = opts[:content_disposition]
     data = File.read!(path)
 
     %__MODULE__{
@@ -51,7 +58,8 @@ defmodule Bamboo.Attachment do
       data: data,
       filename: filename,
       content_type: content_type,
-      content_id: content_id
+      content_id: content_id,
+      content_disposition: content_disposition
     }
   end
 
diff --git a/test/lib/bamboo/email_test.exs b/test/lib/bamboo/email_test.exs
index f60112b1..4b121389 100644
--- a/test/lib/bamboo/email_test.exs
+++ b/test/lib/bamboo/email_test.exs
@@ -92,7 +92,7 @@ defmodule Bamboo.EmailTest do
       attachment = %Bamboo.Attachment{filename: nil, data: "content"}
 
       msg =
-        "You must provide a filename for the attachment, instead got: %Bamboo.Attachment{content_id: nil, content_type: nil, data: \"content\", filename: nil, path: nil}"
+        "You must provide a filename for the attachment, instead got: %Bamboo.Attachment{content_disposition: nil, content_id: nil, content_type: nil, data: \"content\", filename: nil, path: nil}"
 
       assert_raise RuntimeError, msg, fn ->
         new_email() |> put_attachment(attachment)
@@ -103,7 +103,7 @@ defmodule Bamboo.EmailTest do
       attachment = %Bamboo.Attachment{filename: "attachment.docx", data: nil}
 
       msg =
-        "The attachment must contain data, instead got: %Bamboo.Attachment{content_id: nil, content_type: nil, data: nil, filename: \"attachment.docx\", path: nil}"
+        "The attachment must contain data, instead got: %Bamboo.Attachment{content_disposition: nil, content_id: nil, content_type: nil, data: nil, filename: \"attachment.docx\", path: nil}"
 
       assert_raise RuntimeError, msg, fn ->
         new_email() |> put_attachment(attachment)