diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e772c7f..e966104 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,4 +9,4 @@ jobs:
     - name: Run checkpatch review
       uses: webispy/checkpatch-action@master
       env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index d8475af..d886908 100644
--- a/README.md
+++ b/README.md
@@ -20,3 +20,51 @@ From [zephyr](https://github.com/zephyrproject-rtos/zephyr) project:
 ### Disable warning for "No structs that should be const ..."
 
 - https://github.com/nugulinux/docker-devenv/blob/master/patches/0002-ignore_const_struct_warning.patch
+
+## Action setup guide
+
+### Pull Request from owned repository
+
+.github/workflows/main.yml
+
+```yml
+name: checkpatch review
+on: [pull_request]
+jobs:
+  my_review:
+    name: checkpatch review
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+The checkpatch action will posting comments for error/warning result to the PR conversation.
+
+### Pull Request from forked repository
+
+The Github action has a limitation that doesn't have write permission for PR from forked repository. So the action cannot write a comment to the PR.
+
+.github/workflows/main.yml
+
+```yml
+name: checkpatch review
+on: [pull_request]
+jobs:
+  my_review:
+    name: checkpatch review
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@master
+```
+
+You can find the error/waring result from Github action console log.
+
+# License
+
+Since the `checkpatch.pl` file is a script in the Linux kernel source tree, you must follow the [GPL-2.0](https://github.com/torvalds/linux/blob/master/COPYING) license, which is your kernel license.
diff --git a/entrypoint.sh b/entrypoint.sh
index 3e8699e..24192cb 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -16,22 +16,40 @@ pwd
 
 RESULT=0
 
-# Get PR number
-PR=${GITHUB_REF#"refs/pull/"}
-PRNUM=${PR%"/merge"}
+# Check the input parameter
+echo
+if [[ -z "$GITHUB_TOKEN" ]]; then
+    echo -e "\e[0;34mToken is empty. Review PR without comments.\e[0m"
+else
+    echo -e "\e[0;34mReview PR with comments.\e[0m"
+fi
 
 # Get commit list using Github API
+echo
+echo -e "\e[0;34mGet the list of commits included in the PR($GITHUB_REF).\e[0m"
+PR=${GITHUB_REF#"refs/pull/"}
+PRNUM=${PR%"/merge"}
 URL=https://api.github.com/repos/${GITHUB_REPOSITORY}/pulls/${PRNUM}/commits
-list=$(curl $URL -X GET -s -H "Authorization: token ${GITHUB_TOKEN}" | jq '.[].sha' -r)
-echo $list
+echo " - API endpoint: $URL"
+
+list=$(curl $URL -X GET -s | jq '.[].sha' -r)
+len=$(echo "$list" | wc -l)
+echo " - Commits $len: $list"
 
 # Run review.sh on each commit in the PR
+echo
+echo -e "\e[0;34mStart review for each commits.\e[0m"
+
+i=1
 for sha1 in $list; do
-    echo "Check - Commit id $sha1"
+    echo "-------------------------------------------------------------"
+    echo -e "[$i/$len] Check commit - \e[1;34m$sha1\e[0m"
+    echo "-------------------------------------------------------------"
     /review.sh ${sha1} || RESULT=1;
-    echo "Result: ${RESULT}"
+    echo
+    ((i++))
 done
 
-echo "Done"
+echo -e "\e[1;34mDone\e[0m"
 
 exit $RESULT
\ No newline at end of file
diff --git a/review.sh b/review.sh
index b440f67..d215dc1 100755
--- a/review.sh
+++ b/review.sh
@@ -26,7 +26,9 @@ MESSAGE=
 function post_code_message()
 {
     echo "POST to ${CODE_URL} with ${MESSAGE}"
-    curl ${CODE_URL} -H "Authorization: token ${GITHUB_TOKEN}" \
+    curl ${CODE_URL} -s \
+        -H "Authorization: token ${GITHUB_TOKEN}" \
+        -H "Content-Type: application/json" \
         -X POST --data "$(cat <<EOF
 {
     "commit_id": "$COMMIT",
@@ -42,7 +44,8 @@ EOF
 function post_comment_message()
 {
     echo "POST to ${BODY_URL} with ${MESSAGE}"
-    curl ${BODY_URL} -H "Authorization: token ${GITHUB_TOKEN}" \
+    curl ${BODY_URL} -s \
+        -H "Authorization: token ${GITHUB_TOKEN}" \
         -H "Content-Type: application/json" \
         -X POST --data "$(cat <<EOF
 {
@@ -84,6 +87,7 @@ while read -r row
 do
     # End of checkpatch.pl message
     if [[ "$row" =~ ^total: ]]; then
+        echo -e "\e[1m$row\e[0m"
         break
     fi
 
@@ -103,10 +107,16 @@ do
         else
             # An empty line means the paragraph is over.
             if [[ -z $row ]]; then
-                if [[ -z $FILE ]]; then
-                    post_comment_message
+                if [[ ! -z "$GITHUB_TOKEN" ]]; then
+                    echo "Post comment to Github"
+                    if [[ -z $FILE ]]; then
+                        post_comment_message
+                    else
+                        post_code_message
+                    fi
                 else
-                    post_code_message
+                    # Output empty line
+                    echo
                 fi
 
                 # Code review found a problem.
@@ -125,8 +135,18 @@ do
         FOUND=1
         FILE=
         LINE=
+
+        echo -e "\e[1;31m$row\e[0m"
+    else
+        echo $row
     fi
 
 done <<<"$PATCHMAIL"
 
+if [[ "$RESULT" == "0" ]]; then
+    echo -e "\e[1;32m>> Success\e[0m"
+else
+    echo -e "\e[1;31m>> Failure\e[0m"
+fi
+
 exit $RESULT
\ No newline at end of file