diff --git a/Cargo.toml b/Cargo.toml
index 2df47ea..dd0451b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,4 +16,6 @@ path = "src/main.rs"
 clap = "2.33"
 toml = "0.5"
 rust_util = "0.6"
+regex = "1.4"
+
 
diff --git a/src/cmd_default.rs b/src/cmd_default.rs
index 902e81f..badfc73 100644
--- a/src/cmd_default.rs
+++ b/src/cmd_default.rs
@@ -1,5 +1,6 @@
 use clap::{App, Arg, ArgMatches};
 use crate::cmd::CommandError;
+use crate::template_regex::CommitMsgCheckRegex;
 
 pub struct CommandImpl;
 
@@ -14,6 +15,7 @@ impl CommandImpl {
         information!("Verbose count: {}", verbose_count);
         information!(r#"Print using command line:
 commit-msg usage"#);
+        CommitMsgCheckRegex::new_default();
         Ok(())
     }
 }
\ No newline at end of file
diff --git a/src/cmd_install.rs b/src/cmd_install.rs
new file mode 100644
index 0000000..44c3641
--- /dev/null
+++ b/src/cmd_install.rs
@@ -0,0 +1,17 @@
+use clap::{ArgMatches, SubCommand, App};
+use crate::cmd::{Command, CommandError};
+
+pub struct CommandImpl;
+
+impl Command for CommandImpl {
+
+    fn name(&self) -> &str { "install" }
+
+    fn subcommand<'a>(&self) -> App<'a, 'a> {
+        SubCommand::with_name(self.name()).about("Install subcommand")
+    }
+
+    fn run(&self, _arg_matches: &ArgMatches, _sub_arg_matches: &ArgMatches) -> CommandError {
+        Ok(())
+    }
+}
\ No newline at end of file
diff --git a/src/cmd_usage.rs b/src/cmd_usage.rs
index 2f1a483..de0fb46 100644
--- a/src/cmd_usage.rs
+++ b/src/cmd_usage.rs
@@ -8,7 +8,7 @@ impl Command for CommandImpl {
     fn name(&self) -> &str { "usage" }
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
-        SubCommand::with_name(self.name()).about("Sample subcommand")
+        SubCommand::with_name(self.name()).about("Usage subcommand")
     }
 
     fn run(&self, _arg_matches: &ArgMatches, _sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/src/main.rs b/src/main.rs
index 51aed83..421cd29 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,13 +3,17 @@
 mod cmd;
 mod cmd_default;
 mod cmd_usage;
+mod cmd_install;
+mod template;
+mod template_regex;
 
 use clap::App;
 use cmd::{Command, CommandError};
 
 fn main() -> CommandError {
     let commands: Vec<Box<dyn Command>> = vec![
-        Box::new(cmd_usage::CommandImpl)
+        Box::new(cmd_usage::CommandImpl),
+        Box::new(cmd_install::CommandImpl),
     ];
     let mut app = App::new(env!("CARGO_PKG_NAME"))
                     .version(env!("CARGO_PKG_VERSION"))
diff --git a/src/template.rs b/src/template.rs
new file mode 100644
index 0000000..0c320bc
--- /dev/null
+++ b/src/template.rs
@@ -0,0 +1,6 @@
+
+pub trait CommitMsgCheck {
+    fn check(&self, msg: &str) -> bool;
+
+    fn print_hint(&self);
+}
diff --git a/src/template_regex.rs b/src/template_regex.rs
new file mode 100644
index 0000000..b1bc3b0
--- /dev/null
+++ b/src/template_regex.rs
@@ -0,0 +1,50 @@
+use regex::Regex;
+use rust_util::util_term::{BOLD, UNDER, END};
+use crate::template::CommitMsgCheck;
+
+const DEFAULT_COMMIT_MSG_REGEXP: &str = "^(feat|fix|docs|style|refactor|test|chore)(\\([\\w\\-_.]+\\))?:\\s*.*";
+
+pub struct CommitMsgCheckRegex {
+    regex: Regex,
+    hint: String,
+}
+
+impl CommitMsgCheck for CommitMsgCheckRegex {
+    fn check(&self, msg: &str) -> bool {
+        self.regex.is_match(msg)
+    }
+
+    fn print_hint(&self) {
+        println!("[USAGE] {}", self.hint);
+    }
+}
+
+impl CommitMsgCheckRegex {
+    pub fn new_default() -> Self {
+        Self {
+            regex: Regex::new(DEFAULT_COMMIT_MSG_REGEXP).unwrap(),
+            hint: format!(r#"Please follow the commit spec:
+Format: {b}<type>{e}(<scope>){b}: <subject>{e}
+                <scope> is optional
+
+{b}feat{e}: add hat wobble
+^--^  ^------------^
+|     |
+|     +-> Summary in present tense.
+|
++-------> Type: chore, docs, feat, fix, refactor, style, or test.
+
+{b}feat{e}     : new feature for the user, not a new feature for build script
+{b}fix{e}      : bug fix for the user, not a fix to a build script
+{b}docs{e}     : changes to the documentation
+{b}style{e}    : formatting, missing semi colons, etc; no production code change
+{b}refactor{e} : refactoring production code, eg. renaming a variable
+{b}test{e}     : adding missing tests, refactoring tests; no production code change
+{b}chore{e}    : updating grunt tasks etc; no production code change
+
+Reference: {u}https://gist.github.com/joshbuchea/6f47e86d2510bce28f8e7f42ae84c716{e}
+or mirror: {u}https://hatter.ink/wiki/view_raw.action?__access_token=PUBLIC&id=42{e}
+"#, b = BOLD, e = END, u = UNDER),
+        }
+    }
+}