diff --git a/lib/generate/template.js b/lib/generate/template.js
index a4ac4fd3b..9b852288b 100644
--- a/lib/generate/template.js
+++ b/lib/generate/template.js
@@ -2,6 +2,7 @@ var path = require("path");
 var swig = require('swig');
 var hljs = require('highlight.js');
 
+var links = require('../utils/').links;
 var pkg = require('../../package.json');
 
 swig.setDefaults({
@@ -24,7 +25,6 @@ swig.setFilter('mdLink', function(link) {
     return link;
 });
 
-
 // Swig filter: highlight coloration
 swig.setFilter('code', function(code, lang) {
     try {
@@ -44,4 +44,9 @@ swig.setFilter('pathJoin', function(base, _path) {
     return path.join(base, _path);
 });
 
+// Is a link an absolute link
+swig.setFilter('isExternalLink', function(link) {
+    return links.isExternal(link);
+});
+
 module.exports = swig;
diff --git a/lib/utils/links.js b/lib/utils/links.js
index c965dd92e..6606bbf9b 100644
--- a/lib/utils/links.js
+++ b/lib/utils/links.js
@@ -1,6 +1,11 @@
 var url = require('url');
 var path = require('path');
 
+// Is the link an external link
+var isExternal = function(href) {
+    return Boolean(url.parse(href).protocol);
+};
+
 // Return true if the link is relative
 var isRelative = function(href) {
     var parsed = url.parse(href);
@@ -41,6 +46,7 @@ var join = function() {
 
 module.exports = {
     isRelative: isRelative,
+    isExternal: isExternal,
     toAbsolute: toAbsolute,
     join: join
-};
\ No newline at end of file
+};
diff --git a/theme/templates/includes/book/summary.html b/theme/templates/includes/book/summary.html
index 697cce87c..76ee19234 100644
--- a/theme/templates/includes/book/summary.html
+++ b/theme/templates/includes/book/summary.html
@@ -1,10 +1,17 @@
 {% macro articles(_articles) %}
     {% for item in _articles %}
-        <li class="chapter {% if item._path == _input %}active{% endif %}" data-level="{{ item.level }}" {% if item.path %}data-path="{{ item.path|mdLink }}"{% endif %}>
+        {% set externalLink = item.path|isExternalLink %}
+        <li class="chapter {% if item._path == _input %}active{% endif %}" data-level="{{ item.level }}" {% if item.path && !externalLink %}data-path="{{ item.path|mdLink }}"{% endif %}>
             {% if item.path %}
-            <a href="{{ basePath }}/{{ item.path|mdLink }}">
-                <i class="fa fa-check"></i> <b>{{ item.level }}.</b> {{ item.title }}
-            </a>
+                {% if !externalLink %}
+                    <a href="{{ basePath }}/{{ item.path|mdLink }}">
+                        <i class="fa fa-check"></i> <b>{{ item.level }}.</b> {{ item.title }}
+                    </a>
+                {% else %}
+                    <a target="_blank" href="{{ item.path }}">
+                        <i class="fa fa-check"></i> <b>{{ item.level }}.</b> {{ item.title }}
+                    </a>
+                {% endif %}
             {% else %}
             <span><b>{{ item.level }}.</b> {{ item.title }}</span>
             {% endif %}