diff --git a/bot_test.go b/bot_test.go
index 17cedac..0a3007c 100644
--- a/bot_test.go
+++ b/bot_test.go
@@ -184,6 +184,8 @@ func TestSendWithNewAudio(t *testing.T) {
 	msg.Title = "TEST"
 	msg.Duration = 10
 	msg.Performer = "TEST"
+	msg.MimeType = "audio/mpeg"
+	msg.FileSize = 688
 	_, err := bot.Send(msg)
 
 	if err != nil {
diff --git a/configs.go b/configs.go
index 16afef1..00c2830 100644
--- a/configs.go
+++ b/configs.go
@@ -93,6 +93,8 @@ type BaseFile struct {
 	File        interface{}
 	FileID      string
 	UseExisting bool
+	MimeType    string
+	FileSize    int
 }
 
 // Params returns map[string]string representation of BaseFile
@@ -118,6 +120,14 @@ func (file BaseFile) Params() (map[string]string, error) {
 		params["reply_markup"] = string(data)
 	}
 
+	if len(file.MimeType) > 0 {
+		params["mime_type"] = file.MimeType
+	}
+
+	if file.FileSize > 0 {
+		params["file_size"] = strconv.Itoa(file.FileSize)
+	}
+
 	return params, nil
 }
 
diff --git a/types.go b/types.go
index c0d828c..afa1e18 100644
--- a/types.go
+++ b/types.go
@@ -127,9 +127,25 @@ func (m *Message) IsCommand() bool {
 	return m.Text != "" && m.Text[0] == '/'
 }
 
-// Command returns first word from message
+// Command if message is command returns first word from message(entire command)
+// otherwise returns empty string
 func (m *Message) Command() string {
-	return strings.Split(m.Text, " ")[0]
+	if m.IsCommand() {
+		return strings.SplitN(m.Text, " ", 2)[0]
+	}
+	return ""
+}
+
+// CommandArguments if message is command, returns all text after command, excluding the command itself
+// otherwise returns empty string
+func (m *Message) CommandArguments() string {
+	if m.IsCommand() {
+		split := strings.SplitN(m.Text, " ", 2)
+		if len(split) == 2 {
+			return strings.SplitN(m.Text, " ", 2)[1]
+		}
+	}
+	return ""
 }
 
 // PhotoSize contains information about photos, including ID and Width and Height.
diff --git a/types_test.go b/types_test.go
index 68c57bb..416f0cb 100644
--- a/types_test.go
+++ b/types_test.go
@@ -31,6 +31,75 @@ func TestMessageTime(t *testing.T) {
 	}
 }
 
+func TestMessageIsCommandWithCommand(t *testing.T) {
+	message := tgbotapi.Message{Text: "/command"}
+
+	if message.IsCommand() != true {
+		t.Fail()
+	}
+}
+
+func TestIsCommandWithText(t *testing.T) {
+	message := tgbotapi.Message{Text: "some text"}
+
+	if message.IsCommand() != false {
+		t.Fail()
+	}
+}
+
+func TestIsCommandWithEmptyText(t *testing.T) {
+	message := tgbotapi.Message{Text: ""}
+
+	if message.IsCommand() != false {
+		t.Fail()
+	}
+}
+
+func TestCommandWithCommand(t *testing.T) {
+	message := tgbotapi.Message{Text: "/command"}
+
+	if message.Command() != "/command" {
+		t.Fail()
+	}
+}
+
+func TestCommandWithEmptyText(t *testing.T) {
+	message := tgbotapi.Message{Text: ""}
+
+	if message.Command() != "" {
+		t.Fail()
+	}
+}
+
+func TestCommandWithNonCommand(t *testing.T) {
+	message := tgbotapi.Message{Text: "test text"}
+
+	if message.Command() != "" {
+		t.Fail()
+	}
+}
+
+func TestMessageCommandArgumentsWithArguments(t *testing.T) {
+	message := tgbotapi.Message{Text: "/command with arguments"}
+	if message.CommandArguments() != "with arguments" {
+		t.Fail()
+	}
+}
+
+func TestMessageCommandArgumentsWithoutArguments(t *testing.T) {
+	message := tgbotapi.Message{Text: "/command"}
+	if message.CommandArguments() != "" {
+		t.Fail()
+	}
+}
+
+func TestMessageCommandArgumentsForNonCommand(t *testing.T) {
+	message := tgbotapi.Message{Text: "test text"}
+	if message.CommandArguments() != "" {
+		t.Fail()
+	}
+}
+
 func TestChatIsPrivate(t *testing.T) {
 	chat := tgbotapi.Chat{ID: 10, Type: "private"}