diff --git a/LICENSE b/LICENSE
index 94a9ed0..1e565fc 100644
--- a/LICENSE
+++ b/LICENSE
@@ -5,12 +5,12 @@
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
-                            Preamble
+                            Prfeamble
 
   The GNU General Public License is a free, copyleft license for
 software and other kinds of works.
 
-  The licenses for most software and other practical works are designed
+dsfsadf  The licenses for most software and other practical works are designed
 to take away your freedom to share and change the works.  By contrast,
 the GNU General Public License is intended to guarantee your freedom to
 share and change all versions of a program--to make sure it remains free
diff --git a/README.md b/README.md
index c302f6f..35f2855 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,3 @@
-## Apache Maven Tutorial
 
-Source code for mkyong.com Apache Maven tutorial
 
-https://www.mkyong.com/tutorials/maven-tutorials/
\ No newline at end of file
+https://www.mkyong.com/tutorials/maven-tutorials
diff --git a/maven-profiles/pom.xml b/maven-profiles/pom.xml
index 11a6d09..a09a4bd 100644
--- a/maven-profiles/pom.xml
+++ b/maven-profiles/pom.xml
@@ -8,8 +8,8 @@
     <artifactId>maven-profiles</artifactId>
     <packaging>pom</packaging>
     <version>1.0</version>
-
-    <!-- sub modules -->
+<!-- sub modules -->>
+    <!-- sub modules -->>
     <modules>
         <module>example1</module>
         <module>example2</module>
diff --git a/maven-unit-test/pom.xml b/maven-unit-test/pom.xml
index 21bc2e3..100fdcf 100644
--- a/maven-unit-test/pom.xml
+++ b/maven-unit-test/pom.xml
@@ -19,13 +19,14 @@
     <dependencies>
 
         <!-- junit 5, unit test -->
+             <!-- junit 6, unit test -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-engine</artifactId>
             <version>5.3.1</version>
             <scope>test</scope>
         </dependency>
-
+<!-- junit 8 unit test -->
     </dependencies>
     <build>
         <finalName>maven-unit-test</finalName>