diff --git a/CHANGELOG.md b/CHANGELOG.md
index 25b675e1..a6c5fbd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,7 +27,9 @@ none
 none
 
 ### Task
-none
+- [#79 - Pom.xml: added maven-checkstyle-plugin](https://github.com/Asqatasun/Contrast-Finder/issues/79) 
+
+
 
 
 Contrast-Finder 0.5.2, 2017-07-04
diff --git a/documentation/en/30_Contributor_doc/README.md b/documentation/en/30_Contributor_doc/README.md
index b9dd4b62..5c8344a1 100644
--- a/documentation/en/30_Contributor_doc/README.md
+++ b/documentation/en/30_Contributor_doc/README.md
@@ -4,38 +4,28 @@
 * [Release a version of Contrast-Finder](Release/README.md) 
 
 -----
-
-* JavaDoc
-* OWASP Dependency-Check
 * Checking for new dependency / plugin updates
+* OWASP Dependency-Check
+* Checkstyle
+* JavaDoc
 
-## JavaDoc
 
+## Checking for new dependency / plugin updates
 ```bash
-git clone https://github.com/Asqatasun/Contrast-Finder
-cd Contrast-finder
-```
+# Checking for new dependency updates
+mvn versions:display-dependency-updates 
 
-One of the following command lines:
-```bash
-mvn javadoc:javadoc
-mvn javadoc:aggregate
-mvn javadoc:test-javadoc
-mvn javadoc:test-aggregate 
-mvn site
-```
+# Checking for new plugin updates
+mvn versions:display-plugin-updates  
 
-JavaDoc is available in the following directories:
-```bash
-target/site/apidocs
-target/site/testapidocs
+# Checking for new property-linked updates
+mvn versions:display-property-updates 
 ```
 
 ### Documentation
-* [Apache Maven Javadoc Plugin](https://maven.apache.org/plugins/maven-javadoc-plugin/)
-* [Generate Javadocs](https://maven.apache.org/plugins/maven-javadoc-plugin/usage.html)
-* [Javadoc Plugin Documentation](https://maven.apache.org/plugins/maven-javadoc-plugin/javadoc-mojo.html)
-
+* http://www.mojohaus.org/versions-maven-plugin/examples/display-dependency-updates.html
+* http://www.mojohaus.org/versions-maven-plugin/examples/display-plugin-updates.html
+* http://www.mojohaus.org/versions-maven-plugin/examples/display-property-updates.html
 
 
 ##  OWASP Dependency-Check
@@ -69,18 +59,75 @@ mvn dependency-check:help -Ddetail=true -Dgoal=aggregate
 * http://jeremylong.github.io/DependencyCheck/
 * http://jeremylong.github.io/DependencyCheck/dependency-check-maven/
 
-## Checking for new dependency / plugin updates
+
+## Checkstyle
+Scan Contrast-Finder to check the violations of a coding standard.
+
+### Documentation
+* http://checkstyle.sourceforge.net/
+* http://maven.apache.org/plugins/maven-checkstyle-plugin/
+
+### maven-checkstyle-plugin
 ```bash
-# Checking for new dependency updates
-mvn versions:display-dependency-updates 
+git clone https://github.com/Asqatasun/Contrast-Finder
+cd Contrast-finder
 
-# Checking for new plugin updates
-mvn versions:display-plugin-updates  
+# Performs Checkstyle analysis and outputs violations or a count of violations
+# to the console, potentially failing the build.
+mvn checkstyle:check
 
-# Checking for new property-linked updates
-mvn versions:display-property-updates 
+# A reporting task that performs Checkstyle analysis 
+# and generates an HTML report for each module
+mvn checkstyle:checkstyle
+
+# a reporting task that performs Checkstyle analysis
+# and generates an aggregate HTML report 
+mvn checkstyle:checkstyle-aggregate
+mvn site
+
+# Checking for violations as part of the Build
+mvn clean install 
+    # Before, remove comments 
+    # around <goal>check</goal> in pom.xml file
+```
+
+### checkstyle CLI
+```bash
+apt-get install checkstyle
+git clone https://github.com/Asqatasun/Contrast-Finder
+checkstyle  -c checkstyle.xml Contrast-Finder/**/*.java 
+```
+
+
+### CI (Travis, Gitlab, Jenkins)
+...
+
+
+
+## JavaDoc
+
+```bash
+git clone https://github.com/Asqatasun/Contrast-Finder
+cd Contrast-finder
+```
+
+One of the following command lines:
+```bash
+mvn javadoc:javadoc
+mvn javadoc:aggregate
+mvn javadoc:test-javadoc
+mvn javadoc:test-aggregate 
+mvn site
+```
+
+JavaDoc is available in the following directories:
+```bash
+target/site/apidocs
+target/site/testapidocs
 ```
+
 ### Documentation
-* http://www.mojohaus.org/versions-maven-plugin/examples/display-dependency-updates.html
-* http://www.mojohaus.org/versions-maven-plugin/examples/display-plugin-updates.html
-* http://www.mojohaus.org/versions-maven-plugin/examples/display-property-updates.html
+* [Apache Maven Javadoc Plugin](https://maven.apache.org/plugins/maven-javadoc-plugin/)
+* [Generate Javadocs](https://maven.apache.org/plugins/maven-javadoc-plugin/usage.html)
+* [Javadoc Plugin Documentation](https://maven.apache.org/plugins/maven-javadoc-plugin/javadoc-mojo.html)
+
diff --git a/pom.xml b/pom.xml
index 2bf82d57..4564b576 100644
--- a/pom.xml
+++ b/pom.xml
@@ -88,6 +88,35 @@
                 </configuration>
             </plugin>
 
+
+    <!--    Checkstyle
+                http://checkstyle.sourceforge.net/
+                http://maven.apache.org/plugins/maven-checkstyle-plugin/
+                Before, remove comments around <goal>check</goal>
+                usage:  mvn clean install
+                        mvn checkstyle:check                       -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>2.17</version>
+                <executions>
+                    <execution>
+                        <id>validate</id>
+                        <phase>validate</phase>
+                        <configuration>
+                       <!-- <configLocation>checkstyle.xml</configLocation> -->
+                            <encoding>UTF-8</encoding>
+                            <consoleOutput>true</consoleOutput>
+                            <failsOnError>true</failsOnError>
+                            <linkXRef>false</linkXRef>
+                        </configuration>
+                        <goals>
+                         <!-- <goal>check</goal> -->
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
     <!--    OWASP Dependency-Check
                 https://www.owasp.org/index.php/OWASP_Dependency_Check
                 http://jeremylong.github.io/DependencyCheck/
@@ -145,6 +174,7 @@
                     <footerHtmlFile>${project.basedir}/engine/resources/src/main/resources/markdown/html/footer.html</footerHtmlFile>
                 </configuration>
             </plugin>
+
         </plugins>
     </build>
 
@@ -155,7 +185,20 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-project-info-reports-plugin</artifactId>
-                <version>2.9</version>
+              <!--  <version>2.9</version> -->
+            </plugin>
+
+    <!--    Checkstyle
+                http://checkstyle.sourceforge.net/
+                http://maven.apache.org/plugins/maven-checkstyle-plugin/
+                report: target/site/checkstyle-aggregate.html
+                usage:  mvn site
+                        mvn checkstyle:checkstyle-aggregate
+                        mvn checkstyle:checkstyle                            -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>2.17</version>
             </plugin>
 
     <!--    OWASP Dependency-Check