diff --git a/src/fosslight_prechecker/_add.py b/src/fosslight_prechecker/_add.py
index 845838f..c35fc89 100644
--- a/src/fosslight_prechecker/_add.py
+++ b/src/fosslight_prechecker/_add.py
@@ -450,6 +450,7 @@ def add_content(target_path="", input_license="", input_copyright="", input_dl_u
         logger.info(f"\n# File list that have both license and copyright : {len(skip_files)} / {len(total_files_excluded)}")
 
         # Filter by file extension
+        total_files_excluded = [file for file in total_files_excluded if os.path.splitext(file)[1].lower() in EXTENSION_COMMENT_STYLE_MAP_LOWERCASE]
         missing_license = [file for file in missing_license if os.path.splitext(file)[1].lower() in EXTENSION_COMMENT_STYLE_MAP_LOWERCASE]
         missing_copyright = [file for file in missing_copyright if os.path.splitext(file)[1].lower() in EXTENSION_COMMENT_STYLE_MAP_LOWERCASE]
 
diff --git a/src/fosslight_prechecker/_help.py b/src/fosslight_prechecker/_help.py
index 5a55407..01807e6 100644
--- a/src/fosslight_prechecker/_help.py
+++ b/src/fosslight_prechecker/_help.py
@@ -32,9 +32,10 @@
             -n\t\t\t    Don't exclude venv*, node_modules, .*/, and the result of FOSSLight Scanners from the analysis
 
         Options for only 'add' mode
-            -l <license>\t    License name(SPDX format) to add
-            -c <copyright>\t    Copyright to add(ex, 2015-2021 LG Electronics Inc.)
-            -u <dl_location>\t    Download Location to add(ex, https://github.com/fosslight/fosslight_prechecker)"""
+            Please enter any argument with double quotation marks("").
+            -l <license>\t    License name(SPDX format) to add(ex, "Apache-2.0")
+            -c <copyright>\t    Copyright to add(ex, "2015-2021 LG Electronics Inc.")
+            -u <dl_location>\t    Download Location to add(ex, "https://github.com/fosslight/fosslight_prechecker")"""
 
 
 def print_help_msg(exitOpt=True):