diff --git a/chapters/ch04.2-writing-logs.md b/chapters/ch04.2-writing-logs.md
index 256498d..9c0d6c2 100644
--- a/chapters/ch04.2-writing-logs.md
+++ b/chapters/ch04.2-writing-logs.md
@@ -754,7 +754,7 @@ class Logger {
         }
 
         // write logs to the opened file
-        await this.#log_file_handle.write(log_message);
+        await this.#log_file_handle.write(message);
     }
     ...
 }
diff --git a/chapters/ch04.5-rolling-file-support.md b/chapters/ch04.5-rolling-file-support.md
index d5d5f1a..6b4b437 100644
--- a/chapters/ch04.5-rolling-file-support.md
+++ b/chapters/ch04.5-rolling-file-support.md
@@ -131,7 +131,7 @@ const current_time = new Date().getTime();
 We are creating a new `Date` object and uses the `getTime()` method to obtain the current time in milliseconds since epoch.
 
 ```js
-if (size >= size_threshold || (current_time - birthtimeMs >= time_threshold)) {
+if (size >= size_threshold || (current_time - birthtimeMs >= time_threshold * 1000)) {
 ```
 
 We'll be creating a new file:
@@ -478,19 +478,19 @@ Run the `test.js` script. You'll notice a new file created every now and then. L
 ```bash
 $ ls -al ./logs
 
-.rw-r--r--  10k ishtmeet 22 Aug 06:11 Logtar_2023-08-22T00-41-58-132Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-41-59-232Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-01-101Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-02-139Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-03-545Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-04-132Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-05-382Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-06-432Z.log
-.rw-r--r--  10k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-07-109Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:11 Logtar_2023-08-22T00-41-58-132Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-41-59-232Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-01-101Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-02-139Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-03-545Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-04-132Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-05-382Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-06-432Z.log
+.rw-r--r--  20k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-07-109Z.log
 .rw-r--r-- 3.6k ishtmeet 22 Aug 06:12 Logtar_2023-08-22T00-42-08-138Z.log
 ```
 
-Each file is only 10KB, which is exactly what we need. However, the last file is not 10KB because I had to exit the infinite loop caused by `setInterval` by pressing `Ctrl + C`.
+Each file is only 20KB, which is exactly what we need. However, the last file is not 20KB because I had to exit the infinite loop caused by `setInterval` by pressing `Ctrl + C`.
 
 We now have an actual logging library that can be used with any type of project. However, there is still something we need to take care of: providing a middleware function that can be used.