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+## Introduction
+Pmdtester is a regression testing tool ensure that new problems and unexpected behaviors will not be introduced to PMD project after fixing an issue , 
+and new rules can work as expected. It has been integrated into travis CI and is actually used automatically for PRs.
+Regression difference reports are commented back to the PR for the reviewer's information e.g. https://github.com/pmd/pmd/pull/1265#issuecomment-408945709
+
+## Run pmdtester locally
+**Install pmdtester**  
+
+`gem install pmdtester --pre`  
+
+**Verifying your local changes and generate a diff-report locally**  
+
+`pmdtester -r YOUR_LOCAL_PMD_GIT_REPO_ROOT_DIR -b master -p YOUR_DEVELOPMENT_BRANCH`  
+
+The regression difference report is placed in the `YOUR_WORKING_DIR/target/reports/diff` directory.
+
+For more documentation on pmdtester, see [README.rdoc](https://github.com/pmd/pmd-regression-tester/blob/master/README.rdoc)