diff --git a/Makefile b/Makefile
index 798de92b7c6e0f0b9896c6e5eeb4bb54e569b5df..34124b3172ba07e5560647086a4620c71e148de4 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,9 @@ BUILD_TARGET = build
 COMMIT := $(shell git rev-parse --short HEAD)
 # CHANGE_LOG := $(shell echo -n "$(shell hub release show $(shell hub release --include-drafts -L 1))" | base64)
 VERSION := dev-$(shell git describe --tags $(shell git rev-list --tags --max-count=1))
-BUILDFLAGS = -ldflags "-X github.com/jenkins-zh/jenkins-cli/app.version=$(VERSION) -X github.com/jenkins-zh/jenkins-cli/app.commit=$(COMMIT)"
+BUILDFLAGS = -ldflags "-X github.com/jenkins-zh/jenkins-cli/app.version=$(VERSION) \
+	-X github.com/jenkins-zh/jenkins-cli/app.commit=$(COMMIT) \
+	-X github.com/jenkins-zh/jenkins-cli/app.date=$(shell date +'%Y-%m-%d')"
 COVERED_MAIN_SRC_FILE=./main
 PATH  := $(PATH):$(PWD)/bin
 
diff --git a/app/cmd/casc_open.go b/app/cmd/casc_open.go
index 4054030be4772f463541700a9f78a604666cd476..8bfb0c8b6b52f3fe3a4282f6a5d631588cc94353 100644
--- a/app/cmd/casc_open.go
+++ b/app/cmd/casc_open.go
@@ -32,7 +32,7 @@ var cascOpenCmd = &cobra.Command{
 	Long:  i18n.T("Open Configuration as Code page in browser"),
 	PreRun: func(_ *cobra.Command, _ []string) {
 		if cascOpenOption.Browser == "" {
-			cascOpenOption.Browser = os.Getenv("BROWSER")
+			cascOpenOption.Browser = os.Getenv("JCLI_BROWSER")
 		}
 	},
 	RunE: func(_ *cobra.Command, _ []string) (err error) {
diff --git a/app/cmd/completion.go b/app/cmd/completion.go
index 166009a2ef6696d332f786fab5ba8c35abc099d5..4fa829b1b57ca36b851a7c3e80246694a4ee0f4f 100644
--- a/app/cmd/completion.go
+++ b/app/cmd/completion.go
@@ -20,27 +20,43 @@ var completionOptions CompletionOptions
 
 func init() {
 	rootCmd.AddCommand(completionCmd)
-	completionCmd.Flags().StringVarP(&completionOptions.Type, "type", "", "bash",
+
+	flags := completionCmd.Flags()
+	flags.StringVarP(&completionOptions.Type, "type", "", "bash",
 		i18n.T(fmt.Sprintf("Generate different types of shell which are %v", ShellTypes)))
+
+	err := completionCmd.RegisterFlagCompletionFunc("type", func(cmd *cobra.Command, args []string, toComplete string) (
+		i []string, directive cobra.ShellCompDirective) {
+		return ShellTypes, cobra.ShellCompDirectiveDefault
+	})
+	if err != nil {
+		completionCmd.PrintErrf("register flag type for sub-command doc failed %#v\n", err)
+	}
 }
 
 var completionCmd = &cobra.Command{
 	Use:   "completion",
-	Short: i18n.T("Generate bash completion scripts"),
-	Long:  i18n.T("Generate bash completion scripts"),
-	Example: `# Installing bash completion on macOS using homebrew
-	## If running Bash 3.2 included with macOS
-	brew install bash-completion
-	## or, if running Bash 4.1+
-	brew install bash-completion@2
-	## you may need add the completion to your completion directory
-	jcli completion > $(brew --prefix)/etc/bash_completion.d/jcli
-	## If you get trouble, please visit https://github.com/jenkins-zh/jenkins-cli/issues/83.
-    
-    # Load the jcli completion code for zsh[1] into the current shell
-	source <(jcli completion --type zsh)
-	# Set the jcli completion code for zsh[1] to autoload on startup
-	jcli completion --type zsh > "${fpath[1]}/_jcli"`,
+	Short: i18n.T("Generate shell completion scripts"),
+	Long: i18n.T(`Generate shell completion scripts
+Normally you don't need to do more extra work to have this feature if you've installed jcli by brew`),
+	Example: `Installing bash completion on macOS using homebrew
+If running Bash 3.2 included with macOS
+brew install bash-completion
+or, if running Bash 4.1+
+brew install bash-completion@2
+You may need to add the completion to your completion directory by the following command
+jcli completion > $(brew --prefix)/etc/bash_completion.d/jcli
+If you get trouble, please visit https://github.com/jenkins-zh/jenkins-cli/issues/83.
+
+In order to have good experience on zsh completion, ohmyzsh is a good choice.
+Please install ohmyzsh by the following command
+sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
+Get more details about onmyzsh from https://github.com/ohmyzsh/ohmyzsh
+
+Load the jcli completion code for zsh[1] into the current shell
+source <(jcli completion --type zsh)
+Set the jcli completion code for zsh[1] to autoload on startup
+jcli completion --type zsh > "${fpath[1]}/_jcli"`,
 	RunE: func(cmd *cobra.Command, _ []string) (err error) {
 		shellType := completionOptions.Type
 		switch shellType {
diff --git a/app/cmd/open.go b/app/cmd/open.go
index 92679c363ca1adceb892644471b68974ba1f9400..59090ff59f0200a6ee2dbf90a1bbaa3fc734a0c7 100644
--- a/app/cmd/open.go
+++ b/app/cmd/open.go
@@ -42,13 +42,17 @@ func init() {
 }
 
 var openCmd = &cobra.Command{
-	Use:     "open",
-	Short:   i18n.T("Open your Jenkins with a browser"),
-	Long:    i18n.T(`Open your Jenkins with a browser`),
-	Example: `jcli open -n [config name]`,
+	Use:   "open",
+	Short: i18n.T("Open your Jenkins with a browser"),
+	Long:  i18n.T(`Open your Jenkins with a browser`),
+	Example: `jcli open -n [config name]
+Open Jenkins with a specific browser is useful in some use cases. For example, one browser has a proxy setting.
+There are two ways to achieve this:
+jcli open --browser "Google-Chrome"
+JCLI_BROWSER="Google Chrome" jcli open`,
 	PreRun: func(_ *cobra.Command, _ []string) {
 		if openOption.Browser == "" {
-			openOption.Browser = os.Getenv("BROWSER")
+			openOption.Browser = os.Getenv("JCLI_BROWSER")
 		}
 	},
 	RunE: openOption.run,
@@ -99,7 +103,6 @@ func (o *OpenOption) run(_ *cobra.Command, args []string) (err error) {
 // parseName the string expect likes name or name.external
 func (o *OpenOption) parseName(configName string) (jenkins, external string) {
 	array := strings.SplitN(configName, ".", 2)
-	fmt.Println(array)
 	if len(array) > 0 {
 		jenkins = array[0]
 	}
diff --git a/app/cmd/plugin_open.go b/app/cmd/plugin_open.go
index b6522ec329d3829d4e44dc0454108ff156163562..3d417a2838e485ba92569c4c1bf93758e0c3d306 100644
--- a/app/cmd/plugin_open.go
+++ b/app/cmd/plugin_open.go
@@ -30,7 +30,7 @@ var pluginOpenCmd = &cobra.Command{
 	Long:  `Open update center server in browser`,
 	PreRun: func(_ *cobra.Command, _ []string) {
 		if pluginOpenOption.Browser == "" {
-			pluginOpenOption.Browser = os.Getenv("BROWSER")
+			pluginOpenOption.Browser = os.Getenv("JCLI_BROWSER")
 		}
 	},
 	RunE: func(_ *cobra.Command, _ []string) (err error) {