diff --git a/examples/linked-account/main.go b/examples/linked-account/main.go
index 7bb9dc6..b70ac4f 100644
--- a/examples/linked-account/main.go
+++ b/examples/linked-account/main.go
@@ -17,7 +17,6 @@ import (
 const (
 	webhooksPath = "/webhooks"
 	loginPath    = "/signin"
-	logoutPath   = "/signout"
 
 	validUsername = "john"
 	validPassword = "secret"
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e03ee77
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,6 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
diff --git a/messenger.go b/messenger.go
index 67f43c3..8629c01 100644
--- a/messenger.go
+++ b/messenger.go
@@ -19,7 +19,7 @@ const (
 	// SendSettingsURL is API endpoint for saving settings.
 	SendSettingsURL = "https://graph.facebook.com/v2.6/me/thread_settings"
 
-	// MessengerProfileURL is the API endoint where yout bot set properties that define various aspects of the following Messenger Platform features.
+	// MessengerProfileURL is the API endpoint where you set properties that define various aspects of the following Messenger Platform features.
 	// Used in the form https://graph.facebook.com/v2.6/me/messenger_profile?access_token=<PAGE_ACCESS_TOKEN>
 	// https://developers.facebook.com/docs/messenger-platform/reference/messenger-profile-api/
 	MessengerProfileURL = "https://graph.facebook.com/v2.6/me/messenger_profile"
@@ -192,7 +192,7 @@ func (m *Messenger) ProfileByID(id int64, profileFields []string) (Profile, erro
 		qr := QueryResponse{}
 		err = json.Unmarshal(content, &qr)
 		if qr.Error != nil {
-			err = fmt.Errorf("Facebook error : %s", qr.Error.Message)
+			err = fmt.Errorf("facebook error: %s", qr.Error.Message)
 		}
 	}
 
@@ -341,7 +341,7 @@ func (m *Messenger) checkIntegrity(r *http.Request) error {
 func (m *Messenger) dispatch(r Receive) {
 	for _, entry := range r.Entry {
 		for _, info := range entry.Messaging {
-			a := m.classify(info, entry)
+			a := m.classify(info)
 			if a == UnknownAction {
 				fmt.Println("Unknown action:", info)
 				continue
@@ -478,7 +478,7 @@ func (m *Messenger) EnableChatExtension(homeURL HomeURL) error {
 }
 
 // classify determines what type of message a webhook event is.
-func (m *Messenger) classify(info MessageInfo, e Entry) Action {
+func (m *Messenger) classify(info MessageInfo) Action {
 	if info.Message != nil {
 		return TextAction
 	} else if info.Delivery != nil {
diff --git a/messenger_test.go b/messenger_test.go
index 6a1ba00..7633894 100644
--- a/messenger_test.go
+++ b/messenger_test.go
@@ -56,7 +56,7 @@ func TestMessenger_Classify(t *testing.T) {
 		},
 	} {
 		t.Run("action "+name, func(t *testing.T) {
-			action := m.classify(test.msgInfo, Entry{})
+			action := m.classify(test.msgInfo)
 			assert.Exactly(t, action, test.expected)
 		})
 	}
diff --git a/pass_thread_control.go b/pass_thread_control.go
index ca072f4..2c28785 100644
--- a/pass_thread_control.go
+++ b/pass_thread_control.go
@@ -1,17 +1,5 @@
 package messenger
 
-import "encoding/json"
-
-func unmarshalPassThreadControl(data []byte) (passThreadControl, error) {
-	var r passThreadControl
-	err := json.Unmarshal(data, &r)
-	return r, err
-}
-
-func (r *passThreadControl) marshal() ([]byte, error) {
-	return json.Marshal(r)
-}
-
 type passThreadControl struct {
 	Recipient   Recipient `json:"recipient"`
 	TargetAppID int64     `json:"target_app_id"`
diff --git a/response.go b/response.go
index 0d024fe..aa39bd1 100644
--- a/response.go
+++ b/response.go
@@ -77,8 +77,11 @@ func checkFacebookError(r io.Reader) error {
 
 	qr := QueryResponse{}
 	err = json.NewDecoder(r).Decode(&qr)
+	if err != nil {
+		return fmt.Errorf("json unmarshal error: %s", err)
+	}
 	if qr.Error != nil {
-		err = fmt.Errorf("Facebook error : %s", qr.Error.Message)
+		err = fmt.Errorf("facebook error: %s", qr.Error.Message)
 		return err
 	}