diff --git a/README.md b/README.md
index 46d1536..7492c02 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,9 @@ multipart_data:set_simple("some-param-name", "some-value")
 -- Deleting a parameter
 multipart_data:delete("param-name")
 
+-- Setting a file
+multipart_data:set_simple("name", "some-value", "filename", "content_type")
+
 -- Get a multipart/form-data representation of the object
 local body = multipart_data:tostring()
 
diff --git a/spec/example.txt b/spec/example.txt
new file mode 100644
index 0000000..3b18e51
--- /dev/null
+++ b/spec/example.txt
@@ -0,0 +1 @@
+hello world
diff --git a/spec/multipart_spec.lua b/spec/multipart_spec.lua
index bcc2c37..90e442a 100644
--- a/spec/multipart_spec.lua
+++ b/spec/multipart_spec.lua
@@ -630,3 +630,18 @@ hello
   local data = res:tostring()
   assert.are.same(new_body, data)
 end)
+it("set a file example", function()
+    local content_type = "multipart/related; boundary=0f755aa8"
+    local body = ""
+    local res = Multipart(body, content_type)
+    local f = io.open("./spec/example.txt", "rb")
+    local value = f:read("*all")
+    f:close()
+    res:set_simple("example", value, "example.txt", "text/txt")
+    local body = res:tostring()
+    local example_body = table.concat({
+        "--0f755aa8",
+        'Content-Disposition: form-data; name="example"; filename="example.txt"',"content-type: text/txt", "\r\nhello world\n", "--0f755aa8--\r\n"
+    }, "\r\n")
+    assert.are.same(example_body, body)
+  end)
diff --git a/src/multipart.lua b/src/multipart.lua
index 3300b27..67480c2 100644
--- a/src/multipart.lua
+++ b/src/multipart.lua
@@ -271,23 +271,34 @@ function MultipartData:get_all()
 end
 
 
-function MultipartData:set_simple(name, value)
-  if self._data.indexes[name] then
-    self._data.data[self._data.indexes[name]] = {
-      name    = name,
-      value   = value,
-      headers = { 'Content-Disposition: form-data; name="' .. name .. '"' }
-    }
+function MultipartData:set_simple(name, value, filename, content_type)
+    local headers = {'Content-Disposition: form-data; name="' , name , '"'}
+    if filename then
+      headers[4] = '; filename="'
+      headers[5] = filename
+      headers[6] = '"'
+    end
+    if content_type then
+      headers[7] = "\r\ncontent-type: "
+      headers[8] = content_type
+    end
+    headers = concat(headers)
+    if self._data.indexes[name] then
+      self._data.data[self._data.indexes[name]] = {
+        name = name,
+        value = value,
+        headers = {headers}
+      }
 
-  else
-    local part_index = table_size(self._data.indexes) + 1
-    self._data.indexes[name] = part_index
-    self._data.data[part_index] = {
-      name    = name,
-      value   = value,
-      headers = { 'Content-Disposition: form-data; name="' .. name .. '"' }
-    }
-  end
+    else
+      local part_index = table_size(self._data.indexes) + 1
+      self._data.indexes[name] = part_index
+      self._data.data[part_index] = {
+        name    = name,
+        value   = value,
+        headers = {headers}
+      }
+    end
 end