diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 18a45e1..80261d0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,11 +4,15 @@
 
 1. Upgrade to the latest version of MySQLtuner and see if the problem remains
 
-2. Look at the [closed issues](https://github.com/major/mysqltuner-perl/issues?state=closed), we may have already answered a similar problem
+2. Look at the [closed issues](https://github.com/major/mysqltuner-perl/issues?state=closed), we may have already answered a similar problem.
 
-3. [Read the doc](https://github.com/major/mysqltuner-perl/). It is short and useful.
+3. Post new features or bugs you have found at  [ Issue tracker](https://github.com/major/mysqltuner-perl/issues)
 
 
+4. [Read the doc](https://github.com/major/mysqltuner-perl/). It is short and useful.
+5. 
+5. [Read the internal doc](https://github.com/major/MySQLTuner-perl/blob/master/INTERNALS.md). It is short and useful.
+
 ##If you want to contribute ##
-You can find Enhancement asked by community at [Enhancement issue](https://github.com/major/MySQLTuner-perl/labels/enhancement)
-
+* You can find Enhancement asked by community at [Enhancement issue](https://github.com/major/MySQLTuner-perl/labels/enhancement)
+* You can find Bug asked by community at [Bug issue](https://github.com/major/MySQLTuner-perl/labels/bug)