diff --git a/cmdutil/run.go b/cmdutil/run.go
index 96539ce4..73935131 100644
--- a/cmdutil/run.go
+++ b/cmdutil/run.go
@@ -10,6 +10,7 @@ import (
 	"github.com/motemen/ghq/logger"
 )
 
+// Run the command
 func Run(command string, args ...string) error {
 	cmd := exec.Command(command, args...)
 	cmd.Stdout = os.Stdout
@@ -18,6 +19,7 @@ func Run(command string, args ...string) error {
 	return RunCommand(cmd, false)
 }
 
+// RunSilently runs the command silently
 func RunSilently(command string, args ...string) error {
 	cmd := exec.Command(command, args...)
 	cmd.Stdout = ioutil.Discard
@@ -26,6 +28,7 @@ func RunSilently(command string, args ...string) error {
 	return RunCommand(cmd, true)
 }
 
+// RunInDir runs the command in the specified directory
 func RunInDir(dir, command string, args ...string) error {
 	cmd := exec.Command(command, args...)
 	cmd.Stdout = os.Stdout
@@ -35,6 +38,7 @@ func RunInDir(dir, command string, args ...string) error {
 	return RunCommand(cmd, false)
 }
 
+// RunInDirSilently run the command in the specified directory silently
 func RunInDirSilently(dir, command string, args ...string) error {
 	cmd := exec.Command(command, args...)
 	cmd.Stdout = ioutil.Discard
@@ -44,12 +48,15 @@ func RunInDirSilently(dir, command string, args ...string) error {
 	return RunCommand(cmd, true)
 }
 
+// RunFunc for the type command execution
 type RunFunc func(*exec.Cmd) error
 
+// CommandRunner is for running the command
 var CommandRunner = func(cmd *exec.Cmd) error {
 	return cmd.Run()
 }
 
+// RunCommand run the command
 func RunCommand(cmd *exec.Cmd, silent bool) error {
 	if !silent {
 		logger.Log(cmd.Args[0], strings.Join(cmd.Args[1:], " "))
@@ -65,11 +72,13 @@ func RunCommand(cmd *exec.Cmd, silent bool) error {
 	return nil
 }
 
+// RunError is the error type for cmdutil
 type RunError struct {
 	Command   *exec.Cmd
 	ExecError error
 }
 
+// Error to implement error interface
 func (e *RunError) Error() string {
 	return fmt.Sprintf("%s: %s", e.Command.Path, e.ExecError)
 }
diff --git a/commands.go b/commands.go
index dc1041de..d8ab69ee 100644
--- a/commands.go
+++ b/commands.go
@@ -14,7 +14,7 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-var Commands = []cli.Command{
+var commands = []cli.Command{
 	commandGet,
 	commandList,
 	commandLook,
@@ -104,7 +104,7 @@ var commandDocs = map[string]commandDoc{
 // Makes template conditionals to generate per-command documents.
 func mkCommandsTemplate(genTemplate func(commandDoc) string) string {
 	template := "{{if false}}"
-	for _, command := range append(Commands) {
+	for _, command := range append(commands) {
 		template = template + fmt.Sprintf("{{else if (eq .Name %q)}}%s", command.Name, genTemplate(commandDocs[command.Name]))
 	}
 	return template + "{{end}}"
@@ -170,7 +170,7 @@ func doGet(c *cli.Context) error {
 		}
 	}
 
-	url, err := NewURL(argURL)
+	url, err := newURL(argURL)
 	if err != nil {
 		return err
 	}
@@ -178,7 +178,7 @@ func doGet(c *cli.Context) error {
 	isSSH := c.Bool("p")
 	if isSSH {
 		// Assume Git repository if `-p` is given.
-		if url, err = ConvertGitURLHTTPToSSH(url); err != nil {
+		if url, err = convertGitURLHTTPToSSH(url); err != nil {
 			return err
 		}
 	}
@@ -264,8 +264,8 @@ func doList(c *cli.Context) error {
 			return true
 		}
 	} else {
-		if hasSchemePattern.MatchString(query) || scpLikeUrlPattern.MatchString(query) {
-			if url, err := NewURL(query); err == nil {
+		if hasSchemePattern.MatchString(query) || scpLikeURLPattern.MatchString(query) {
+			if url, err := newURL(query); err == nil {
 				if repo, err := LocalRepositoryFromURL(url); err == nil {
 					query = repo.RelPath
 				}
@@ -357,7 +357,7 @@ func doLook(c *cli.Context) error {
 	}
 
 	if len(reposFound) == 0 {
-		if url, err := NewURL(name); err == nil {
+		if url, err := newURL(name); err == nil {
 			repo, err := LocalRepositoryFromURL(url)
 			if err != nil {
 				return err
@@ -415,12 +415,12 @@ func doImport(c *cli.Context) error {
 	}
 
 	processLine := func(line string) error {
-		url, err := NewURL(line)
+		url, err := newURL(line)
 		if err != nil {
 			return fmt.Errorf("Could not parse URL <%s>: %s", line, err)
 		}
 		if isSSH {
-			url, err = ConvertGitURLHTTPToSSH(url)
+			url, err = convertGitURLHTTPToSSH(url)
 			if err != nil {
 				return fmt.Errorf("Could not convert URL <%s>: %s", url, err)
 			}
diff --git a/git.go b/git.go
index 20d1a1b7..57ae58e0 100644
--- a/git.go
+++ b/git.go
@@ -59,7 +59,7 @@ var (
 	featureConfigURLMatchVersion = semver.MustParse("1.8.5")
 )
 
-func GitHasFeatureConfigURLMatch() error {
+func gitHasFeatureConfigURLMatch() error {
 	cmd := exec.Command("git", "--version")
 	buf, err := cmd.Output()
 
diff --git a/git_test.go b/git_test.go
index 901c50e0..b0d8af02 100644
--- a/git_test.go
+++ b/git_test.go
@@ -14,7 +14,7 @@ func TestGitConfigAll(t *testing.T) {
 }
 
 func TestGitConfigURL(t *testing.T) {
-	if GitHasFeatureConfigURLMatch() != nil {
+	if gitHasFeatureConfigURLMatch() != nil {
 		t.Skip("Git does not have config --get-urlmatch feature")
 	}
 
diff --git a/go_import.go b/go_import.go
index 0a5c02f9..d4f1594d 100644
--- a/go_import.go
+++ b/go_import.go
@@ -23,7 +23,7 @@ func detectGoImport(u *url.URL) (string, *url.URL, error) {
 		},
 	}
 	req, _ := http.NewRequest(http.MethodGet, goGetU.String(), nil)
-	req.Header.Add("User-Agent", fmt.Sprintf("ghq/%s (+https://github.com/motemen/ghq)", Version))
+	req.Header.Add("User-Agent", fmt.Sprintf("ghq/%s (+https://github.com/motemen/ghq)", version))
 	resp, err := cli.Do(req)
 	if err != nil {
 		return "", nil, err
diff --git a/logger/log.go b/logger/log.go
index 1863da3c..71599c64 100644
--- a/logger/log.go
+++ b/logger/log.go
@@ -12,7 +12,7 @@ var logger = colorine.NewLogger(
 		"hg":       colorine.Verbose,
 		"svn":      colorine.Verbose,
 		"darcs":    colorine.Verbose,
-		"bzr"  :    colorine.Verbose,
+		"bzr":      colorine.Verbose,
 		"skip":     colorine.Verbose,
 		"cd":       colorine.Verbose,
 		"resolved": colorine.Verbose,
@@ -30,6 +30,7 @@ func init() {
 	logger.SetOutput(os.Stderr)
 }
 
+// Log output
 func Log(prefix, message string) {
 	logger.Log(prefix, message)
 }
diff --git a/main.go b/main.go
index 4bd7eb30..2bc4cd28 100644
--- a/main.go
+++ b/main.go
@@ -8,7 +8,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-const Version = "0.10.2"
+const version = "0.10.2"
 
 var revision = "HEAD"
 
@@ -27,9 +27,9 @@ func newApp() *cli.App {
 	app := cli.NewApp()
 	app.Name = "ghq"
 	app.Usage = "Manage GitHub repository clones"
-	app.Version = fmt.Sprintf("%s (rev:%s)", Version, revision)
+	app.Version = fmt.Sprintf("%s (rev:%s)", version, revision)
 	app.Author = "motemen"
 	app.Email = "motemen@gmail.com"
-	app.Commands = Commands
+	app.Commands = commands
 	return app
 }
diff --git a/remote_repository.go b/remote_repository.go
index ff5c666f..db7fe92b 100644
--- a/remote_repository.go
+++ b/remote_repository.go
@@ -135,7 +135,7 @@ func (repo *OtherRepository) IsValid() bool {
 }
 
 func (repo *OtherRepository) VCS() (*VCSBackend, *url.URL) {
-	if err := GitHasFeatureConfigURLMatch(); err != nil {
+	if err := gitHasFeatureConfigURLMatch(); err != nil {
 		logger.Log("warning", err.Error())
 	} else {
 		// Respect 'ghq.url.https://ghe.example.com/.vcs' config variable
diff --git a/url.go b/url.go
index 479998db..6e2dedb0 100644
--- a/url.go
+++ b/url.go
@@ -14,14 +14,14 @@ import (
 // (golang hasn't supported Perl-like negative look-behind match)
 var (
 	hasSchemePattern          = regexp.MustCompile("^[^:]+://")
-	scpLikeUrlPattern         = regexp.MustCompile("^([^@]+@)?([^:]+):(/?.+)$")
+	scpLikeURLPattern         = regexp.MustCompile("^([^@]+@)?([^:]+):(/?.+)$")
 	looksLikeAuthorityPattern = regexp.MustCompile(`[A-Za-z0-9]\.[A-Za-z]+(?::\d{1,5})?$`)
 )
 
-func NewURL(ref string) (*url.URL, error) {
+func newURL(ref string) (*url.URL, error) {
 	if !hasSchemePattern.MatchString(ref) {
-		if scpLikeUrlPattern.MatchString(ref) {
-			matched := scpLikeUrlPattern.FindStringSubmatch(ref)
+		if scpLikeURLPattern.MatchString(ref) {
+			matched := scpLikeURLPattern.FindStringSubmatch(ref)
 			user := matched[1]
 			host := matched[2]
 			path := matched[3]
@@ -58,7 +58,7 @@ func NewURL(ref string) (*url.URL, error) {
 	return url, nil
 }
 
-func ConvertGitURLHTTPToSSH(url *url.URL) (*url.URL, error) {
+func convertGitURLHTTPToSSH(url *url.URL) (*url.URL, error) {
 	user := "git"
 	if url.User != nil {
 		user = url.User.Username()
diff --git a/url_test.go b/url_test.go
index c903d9a1..0d1f0f57 100644
--- a/url_test.go
+++ b/url_test.go
@@ -62,7 +62,7 @@ func TestNewURL(t *testing.T) {
 			if tc.setup != nil {
 				defer tc.setup()()
 			}
-			repo, err := NewURL(tc.url)
+			repo, err := newURL(tc.url)
 			if err != nil {
 				t.Errorf("error should be nil but: %s", err)
 			}
@@ -92,11 +92,11 @@ func TestConvertGitURLHTTPToSSH(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.url, func(t *testing.T) {
-			httpsURL, err := NewURL(tc.url)
+			httpsURL, err := newURL(tc.url)
 			if err != nil {
 				t.Errorf("error should be nil but: %s", err)
 			}
-			sshURL, err := ConvertGitURLHTTPToSSH(httpsURL)
+			sshURL, err := convertGitURLHTTPToSSH(httpsURL)
 			if err != nil {
 				t.Errorf("error should be nil but: %s", err)
 			}
diff --git a/vcs_test.go b/vcs_test.go
index c59d5af5..a2ff614e 100644
--- a/vcs_test.go
+++ b/vcs_test.go
@@ -20,13 +20,13 @@ func TestVCSBackend(t *testing.T) {
 	}
 	defer os.RemoveAll(tempDir)
 	localDir := filepath.Join(tempDir, "repo")
-	commands := []*exec.Cmd{}
-	lastCommand := func() *exec.Cmd { return commands[len(commands)-1] }
+	_commands := []*exec.Cmd{}
+	lastCommand := func() *exec.Cmd { return _commands[len(_commands)-1] }
 	defer func(orig func(cmd *exec.Cmd) error) {
 		cmdutil.CommandRunner = orig
 	}(cmdutil.CommandRunner)
 	cmdutil.CommandRunner = func(cmd *exec.Cmd) error {
-		commands = append(commands, cmd)
+		_commands = append(_commands, cmd)
 		return nil
 	}