diff --git a/Chapter01/P01_CountDuplicateCharacters/src/modern/challenge/Main.java b/Chapter01/P01_CountDuplicateCharacters/src/modern/challenge/Main.java
index 8351d51f..36d966e4 100644
--- a/Chapter01/P01_CountDuplicateCharacters/src/modern/challenge/Main.java
+++ b/Chapter01/P01_CountDuplicateCharacters/src/modern/challenge/Main.java
@@ -4,6 +4,7 @@
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+//comments
 public class Main {
 
     private static final String TEXT = "Be strong, be fearless, be beautiful. "
@@ -68,4 +69,4 @@ private static void displayExecutionTime(long time) {
                 TimeUnit.MILLISECONDS.convert(time, TimeUnit.NANOSECONDS) + " ms)");
     }
 
-}
\ No newline at end of file
+}