diff --git a/README.md b/README.md
index e53026e..2ff3a93 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ $ git commit -m "[patch] increment patch version"
 ## the commit comment contains "[patch]"
 
 $ gitwerk semver-auto
+{:status :updated :old-version v0.0.1 :new-version v0.0.2}
 ## increments tag to v0.0.2
 
 ###...
@@ -37,6 +38,7 @@ $ git commit -m "[tag.suffix=-alpha] [minor] increment minor version and add suf
 ## the commit comment contains "[minor]" and "[tag.suffix=-alpha]"
 
 $ gitwerk semver-auto
+{:status :updated :old-version v0.0.2 :new-version v0.1.0-alpha}
 ## increments tag to v0.1.0-alpha
 
 ###...
@@ -45,6 +47,7 @@ $ git commit -m "[tag.prefix=] [tag.suffix=] [major] increment major version and
 ## the commit comment contains "[major]", "[tag.prefix=]" and "[tag.suffix=]"
 
 $ gitwerk semver-auto
+{:status :updated :old-version v0.1.0-alpha :new-version 1.0.0}
 ## increments tag to 1.0.0
 
 ###...
@@ -53,6 +56,7 @@ $ git commit -m "[tag.prefix=v] just adding prefix"
 ## the commit comment contains "[tag.prefix=v]"
 
 $ gitwerk semver-auto
+{:status :updated :old-version 1.0.0 :new-version v1.0.0}
 ## increments tag to v1.0.0
 ```
 
diff --git a/src/gitwerk/core.clj b/src/gitwerk/core.clj
index c7588ba..cd528de 100644
--- a/src/gitwerk/core.clj
+++ b/src/gitwerk/core.clj
@@ -2,12 +2,27 @@
   (:require
    [clojure.spec.alpha :as spec]
    [clojure.tools.cli :as cli]
+   [clojure.string :as string]
    [clojure.edn :as edn]
    [clojure.java.io :as io]
    [gitwerk.service.runner :as runner])
   (:gen-class))
 
-(def cli-header "Usage: gitwerk [command] [options]")
+(def cli-header
+  (string/join
+    "\n"
+    ["gitwerk is a CLI tool for supporting Git(Hub) operations on CI."
+     ""
+     "Usage: gitwerk [command] [options]"
+     ""
+     "Available commands:"
+     "  clone [url]   clone git repository"
+     "  log           show git logs of current directory"
+     "  semver [type] print incremented version"
+     "  semver-auto   increment version by latest git log message contexts"
+     "  tag           show git tags of current directory"
+     ""
+     "Options:"]))
 (def cli-options
   [["-f" "--file PATH" "config"
     :id :config-filename