diff --git a/guide/english/java/index.md b/guide/english/java/index.md
index 85507184f1..ee4e6e3109 100644
--- a/guide/english/java/index.md
+++ b/guide/english/java/index.md
@@ -116,7 +116,9 @@ Now open the terminal / Command Prompt. Change your current directory in the ter
 
     $ javac HelloWorld.java
 
-Now run the file using `java` command!
+If your program compiled successfully, you can see the bytecode file or class file  `HelloWorld.class` generated by the java compiler `javac` in the same folder.  
+
+Now run the file using `java` command! Please note that the `.class` extension is not used while running the class file.
 
     $ java HelloWorld
     Hello, World