Update help texts

main.go

@@ -142,27 +142,27 @@ func main() {
 	gitdir := flag.String(
 		"C",
 		cwd,
-		"git directory",
+		"The directory containing the git repository in which to archive the pads.",
 	)
 	doPush := flag.Bool(
 		"push",
 		false,
-		"push repository to remote",
+		"Push the changes to the remote specified by remoteUrl",
 	)
 	username := flag.String(
 		"username",
 		"",
-		"username",
+		"The username for authenticating to the remote.",
 	)
 	password := flag.String(
 		"password",
 		os.Getenv("GIT_PASSWORD"),
-		"password",
+		"The password for authenticating to the remote. Can also be specified via the environment variable GIT_PASSWORD.",
 	)
 	remoteUrl := flag.String(
 		"url",
 		"",
-		"url of remote",
+		"URL to push changes to.",
 	)
 
 	flag.Parse()