diff --git a/common/autoware_debug_tools/README.md b/common/autoware_debug_tools/README.md
index a102e550..62d0119e 100644
--- a/common/autoware_debug_tools/README.md
+++ b/common/autoware_debug_tools/README.md
@@ -123,16 +123,16 @@ ros2 run autoware_debug_tools rosout_log_reconstructor
 ## Frequent Log Checker
 
 This script shows the frequent log from the `launch.log`.
-In detail, the log which appears more than the threshold times during the duration will be shown.
+In detail, the log which appears more than the threshold times during the duration will be list down.
 
 ### Usage
 
 ```bash
-ros2 run autoware_debug_tools frequent_log_checker <file-path>
+ros2 run autoware_debug_tools frequent_log_checker <launch-log-path>
 ```
 
-The command options are
+The command has following options.
 
-- `-d`: duration to check the frequent log
+- `-d`: duration to count the number of log
 - `-c`: threshold of the log count during the duration
 - `-f`: log format. Several log formats are pre-defined in the script.
diff --git a/common/autoware_debug_tools/autoware_debug_tools/frequent_log_checker.py b/common/autoware_debug_tools/autoware_debug_tools/frequent_log_checker.py
index 44db181d..487d3909 100755
--- a/common/autoware_debug_tools/autoware_debug_tools/frequent_log_checker.py
+++ b/common/autoware_debug_tools/autoware_debug_tools/frequent_log_checker.py
@@ -35,7 +35,7 @@ def is_in(self, log_list):
         return False
 
 
-def check(log_file, duration_to_check, log_count_threshold, log_format):
+def check(log_file, duration_to_count, log_count_threshold, log_format):
     recent_log_list = []
     unique_frequent_log_list = []
 
@@ -70,7 +70,7 @@ def check(log_file, duration_to_check, log_count_threshold, log_format):
             # remove obsolete or already frequent log
             for log in recent_log_list[:]:
                 duration = timestamp - log.timestamp
-                if duration_to_check < duration:
+                if duration_to_count < duration:
                     recent_log_list.remove(log)
 
             # extract duplicated (= frequent) log
@@ -95,7 +95,7 @@ def check(log_file, duration_to_check, log_count_threshold, log_format):
 def main():
     parser = argparse.ArgumentParser(description="frequent log checker")
     parser.add_argument("log_file", help="launch log file")
-    parser.add_argument("-d", "--log-duration", default=1.0, help="duration to check log")
+    parser.add_argument("-d", "--log-duration", default=1.0, help="duration to count log")
     parser.add_argument("-c", "--log-count", default=2, help="log count threshold")
     parser.add_argument("-f", "--log-format", default="1", help="log format")
     args = parser.parse_args()