diff --git a/README.md b/README.md
index b205e95..3287e07 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,17 @@ https://apunteak.lainoa.eus/post6035433e2a78d6208795d0c7
 
 ## Test
     node index.js
-[localhost:8080](http:localhost:8080){target="_blank"}
\ No newline at end of file
+[localhost:8080](http:localhost:8080){target="_blank"}
+
+(function() {
+  var links = document.links;
+  for (var i = 0, linksLength = links.length; i < linksLength; i++) {
+    if (links[i].hostname != window.location.hostname) {
+      links[i].target = "_blank";
+      links[i].setAttribute("rel", "noopener noreferrer");
+      links[i].className += " externalLink";
+    } else {
+      links[i].className += " localLink";    
+    }
+  }
+})();
\ No newline at end of file