diff --git a/package.json b/package.json
index 216069df..49b4393d 100644
--- a/package.json
+++ b/package.json
@@ -82,6 +82,7 @@
     "gifsicle": "1.0.0",
     "highlightjs": "9.10.0",
     "markdown-it": "8.4.0",
+    "markdown-it-link-attributes": "^2.1.0",
     "moment-timezone": "0.5.4",
     "ng-sortable": "1.3.1"
   }
diff --git a/src/app/services/directive/markdown.js b/src/app/services/directive/markdown.js
index bc5958d4..f2fd6ebd 100644
--- a/src/app/services/directive/markdown.js
+++ b/src/app/services/directive/markdown.js
@@ -33,6 +33,12 @@ angular.module('sb.services')
             linkify: true
         });
 
+        md.use($window.markdownitLinkAttributes, {
+            attrs: {
+                rel: 'nofollow'
+            }
+        });
+
         return {
             restrict: 'E',
             scope: {