diff --git a/os/gcmd/gcmd_command_help.go b/os/gcmd/gcmd_command_help.go
index 1d86f06dd..7381c01ab 100644
--- a/os/gcmd/gcmd_command_help.go
+++ b/os/gcmd/gcmd_command_help.go
@@ -65,16 +65,17 @@ func (c *Command) Print() {
 			}
 		}
 		for _, cmd := range c.commands {
+			brief := gstr.Replace(cmd.Brief, "\n", "")
 			// Add "..." to brief for those commands that also have sub-commands.
 			if len(cmd.commands) > 0 {
-				cmd.Brief = gstr.TrimRight(cmd.Brief, ".") + "..."
+				brief = gstr.TrimRight(brief, ".") + "..."
 			}
 			var (
 				spaceLength    = maxSpaceLength - len(cmd.Name)
 				wordwrapPrefix = gstr.Repeat(" ", len(prefix+cmd.Name)+spaceLength+4)
 				lineStr        = fmt.Sprintf(
 					"%s%s%s%s\n",
-					prefix, cmd.Name, gstr.Repeat(" ", spaceLength+4), gstr.Trim(cmd.Brief),
+					prefix, cmd.Name, gstr.Repeat(" ", spaceLength+4), gstr.Trim(brief),
 				)
 			)
 			lineStr = gstr.WordWrap(lineStr, maxLineChars, "\n"+wordwrapPrefix)
@@ -102,11 +103,12 @@ func (c *Command) Print() {
 				continue
 			}
 			var (
+				brief          = gstr.Trim(gstr.Replace(arg.Brief, "\n", ""))
 				spaceLength    = maxSpaceLength - len(arg.Name)
 				wordwrapPrefix = gstr.Repeat(" ", len(prefix+arg.Name)+spaceLength+4)
 				lineStr        = fmt.Sprintf(
 					"%s%s%s%s\n",
-					prefix, arg.Name, gstr.Repeat(" ", spaceLength+4), gstr.Trim(arg.Brief),
+					prefix, arg.Name, gstr.Repeat(" ", spaceLength+4), brief,
 				)
 			)
 			lineStr = gstr.WordWrap(lineStr, maxLineChars, "\n"+wordwrapPrefix)
@@ -145,11 +147,12 @@ func (c *Command) Print() {
 				nameStr = fmt.Sprintf("-/--%s", arg.Name)
 			}
 			var (
+				brief          = gstr.Trim(gstr.Replace(arg.Brief, "\n", ""))
 				spaceLength    = maxSpaceLength - len(nameStr)
 				wordwrapPrefix = gstr.Repeat(" ", len(prefix+nameStr)+spaceLength+4)
 				lineStr        = fmt.Sprintf(
 					"%s%s%s%s\n",
-					prefix, nameStr, gstr.Repeat(" ", spaceLength+4), gstr.Trim(arg.Brief),
+					prefix, nameStr, gstr.Repeat(" ", spaceLength+4), brief,
 				)
 			)
 			lineStr = gstr.WordWrap(lineStr, maxLineChars, "\n"+wordwrapPrefix)
diff --git a/os/gcmd/gcmd_z_unit_feature_object2_test.go b/os/gcmd/gcmd_z_unit_feature_object2_test.go
index 2d16b6f09..4e050e047 100644
--- a/os/gcmd/gcmd_z_unit_feature_object2_test.go
+++ b/os/gcmd/gcmd_z_unit_feature_object2_test.go
@@ -86,15 +86,21 @@ PLATFORMS
 	plan9     386
 	plan9     amd64
 	solaris   amd64
+`
+	commandBuildBriefPack = `
+destination file path for packed file. if extension of the filename is ".go" and "-n" option is given, 
+it enables packing SRC to go file, or else it packs SRC into a binary file.
+
 `
 )
 
 func init() {
 	gtag.Sets(map[string]string{
-		`commandBuildBrief`: commandBuildBrief,
-		`commandBuildDc`:    commandBuildDc,
-		`commandBuildEg`:    commandBuildEg,
-		`commandBuildAd`:    commandBuildAd,
+		`commandBuildBrief`:     commandBuildBrief,
+		`commandBuildDc`:        commandBuildDc,
+		`commandBuildEg`:        commandBuildEg,
+		`commandBuildAd`:        commandBuildAd,
+		`commandBuildBriefPack`: commandBuildBriefPack,
 	})
 }
 
@@ -109,7 +115,7 @@ type commandBuildInput struct {
 	Extra   string `short:"e" name:"extra"   brief:"extra custom \"go build\" options"`
 	Mod     string `short:"m" name:"mod"     brief:"like \"-mod\" option of \"go build\", use \"-m none\" to disable go module"`
 	Cgo     bool   `short:"c" name:"cgo"     brief:"enable or disable cgo feature, it's disabled in default" orphan:"true"`
-	Pack    string `name:"pack" brief:"pack specified folder into temporary go file before building and removes it after built"`
+	Pack    string `name:"pack" brief:"{commandBuildBriefPack}"`
 }
 type commandBuildOutput struct{}