diff --git a/src/detections/configs.rs b/src/detections/configs.rs
index f17ea5a0..5f97037e 100644
--- a/src/detections/configs.rs
+++ b/src/detections/configs.rs
@@ -1,7 +1,7 @@
 use crate::detections::print::AlertMessage;
 use crate::detections::utils;
 use chrono::{DateTime, Utc};
-use clap::{App, AppSettings, Arg, ArgMatches};
+use clap::{App, AppSettings, ArgMatches};
 use hashbrown::HashMap;
 use hashbrown::HashSet;
 use lazy_static::lazy_static;
@@ -80,6 +80,7 @@ fn build_app<'a>() -> ArgMatches<'a> {
     -u --update-rules 'Update to the latest rules in the hayabusa-rules github repository.'
     -m --min-level=[LEVEL] 'Minimum level for rules. (Default: informational)'
     -l --live-analysis 'Analyze the local C:\\Windows\\System32\\winevt\\Logs folder (Windows Only. Administrator privileges required.)'
+    --level-tuning=<LEVEL_TUNING_FILE> 'Fix rule file's level [default: ./config/level_tuning.txt]'
     --start-timeline=[STARTTIMELINE] 'Start time of the event logs to load. (Example: '2018/11/28 12:00:00 +09:00')'
     --end-timeline=[ENDTIMELINE] 'End time of the event logs to load. (Example: '2018/11/28 12:00:00 +09:00')'
     --rfc-2822 'Output date and time in RFC 2822 format. (Example: Mon, 07 Aug 2006 12:34:56 -0600)'
@@ -95,11 +96,6 @@ fn build_app<'a>() -> ArgMatches<'a> {
         .version("1.1.0")
         .author("Yamato Security (https://github.com/Yamato-Security/hayabusa)")
         .setting(AppSettings::VersionlessSubcommands)
-        .arg(
-            // TODO: When update claps to 3.x, these can write in usage texts...
-            Arg::from_usage("--level-tuning=[LEVEL_TUNING_FILE] 'Fix rule file's level'")
-                .default_value("./config/level_tuning.txt"),
-        )
         .usage(usages)
         .args_from_usage(usages)
         .get_matches()
diff --git a/src/main.rs b/src/main.rs
index 133c8d40..9c08e7d6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -112,31 +112,34 @@ impl App {
             .args
             .is_present("level-tuning")
         {
-            if let Some(level_tuning_config_path) = configs::CONFIG
+            let level_tuning_config_path = configs::CONFIG
                 .read()
                 .unwrap()
                 .args
                 .value_of("level-tuning")
-            {
-                if Path::new(level_tuning_config_path).exists() {
-                    if let Err(err) = LevelTuning::run(level_tuning_config_path, configs::CONFIG
+                .unwrap_or("./config/level_tuning.txt")
+                .to_string();
+
+            if Path::new(&level_tuning_config_path).exists() {
+                if let Err(err) = LevelTuning::run(
+                    &level_tuning_config_path,
+                    configs::CONFIG
                         .read()
                         .unwrap()
                         .args
                         .value_of("rules")
-                        .unwrap_or("rules")) {
-                        AlertMessage::alert(&mut BufWriter::new(std::io::stderr().lock()), &err)
-                            .ok();
-                    }
-                } else {
-                    AlertMessage::alert(
-                        &mut BufWriter::new(std::io::stderr().lock()),
-                        "Need rule_levels.txt file to use --level-tuning option",
-                    )
-                    .ok();
+                        .unwrap_or("rules"),
+                ) {
+                    AlertMessage::alert(&mut BufWriter::new(std::io::stderr().lock()), &err).ok();
                 }
-                return;
+            } else {
+                AlertMessage::alert(
+                    &mut BufWriter::new(std::io::stderr().lock()),
+                    "Need rule_levels.txt file to use --level-tuning option",
+                )
+                .ok();
             }
+            return;
         }
 
         if !Path::new("./config").exists() {