diff --git a/_layouts/post.html b/_layouts/post.html
index f2231e7..79cb211 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -7,3 +7,32 @@ layout: default
 <div class="content">
     <div class="post">{{ content }}</div>
 </div>
+
+{% assign hasSimilar = '' %}
+{% for post in site.posts  %}
+    {% assign postHasSimilar = false %}
+    {% for tag in post.categories %}
+        {% for thisTag in page.categories %}
+            {% if postHasSimilar == false and hasSimilar.size < 6 and post != page and tag == thisTag %}
+                {% if hasSimilar.size == 0 %}
+                <div class="panel-body">
+                <h4>Related Posts</h4>
+                <ul>
+                {% endif %}
+                <li class="relatedPost">
+                    <a href="{{ site.url }}{{ post.url }}">{{ post.title }}
+                    {% if post.categories %}
+                        (Categories: {{ post.categories | join: ', ' }})
+                    {% endif %}
+                    </a>
+                </li>
+                {% capture hasSimilar %}{{ hasSimilar }}*{% endcapture %}
+                {% assign postHasSimilar = true %}
+            {% endif %}
+        {% endfor %}
+    {% endfor %}
+{% endfor %}
+{% if hasSimilar.size > 0 %}
+    </ul>
+    </div>
+{% endif %}
diff --git a/_posts/2013-12-23-ruby-json.markdown b/_posts/2013-12-23-ruby-json.markdown
index 9a299bc..f0da76e 100644
--- a/_posts/2013-12-23-ruby-json.markdown
+++ b/_posts/2013-12-23-ruby-json.markdown
@@ -2,7 +2,7 @@
 layout: post
 title:  "Parsing JSON with Ruby"
 date:   2013-12-23 00:18:23 +0700
-categories: ruby
+categories: [ruby]
 ---
 Parsing JSON with Ruby is actually extremely easy. All you have to do is have the json gem installed (`gem install json`) and call the `JSON.parse` method on the JSON data to convert it to ruby hashes. If you look at this small program here, you can see how I have implemented parsing JSON in Ruby.
 
diff --git a/_posts/2013-12-23-welcome-to-simply-grey.markdown b/_posts/2013-12-23-welcome-to-simply-grey.markdown
index 1e96a0e..1d4ed27 100644
--- a/_posts/2013-12-23-welcome-to-simply-grey.markdown
+++ b/_posts/2013-12-23-welcome-to-simply-grey.markdown
@@ -2,7 +2,7 @@
 layout: post
 title:  "Welcome to Simply Grey"
 date:   2013-12-23 00:18:23 +0700
-categories: simplygrey
+categories: [simplygrey]
 ---
 SimplyGrey is a simple, easy to use theme for Jekyll that compromises of mainly grey colours. A lot of people enjoy the simplistic look of grey and also find it easier to read.
 
diff --git a/_posts/2016-04-19-email-backend-with-smtp-gmail.markdown b/_posts/2016-04-19-email-backend-with-smtp-gmail.markdown
index 7227fac..62e2118 100644
--- a/_posts/2016-04-19-email-backend-with-smtp-gmail.markdown
+++ b/_posts/2016-04-19-email-backend-with-smtp-gmail.markdown
@@ -2,7 +2,7 @@
 layout: post
 title:  "Email BackEnd with SMTP Gmail"
 date:   2016-04-19 02:28:15 +0700
-categories: django
+categories: [python, django]
 ---
 Add this configurations in your `settings.py`
 
diff --git a/_posts/2016-04-19-remove-all-files-pyc-with-recrusive-method.markdown b/_posts/2016-04-19-remove-all-files-pyc-with-recrusive-method.markdown
index 44aaf56..6093cbf 100644
--- a/_posts/2016-04-19-remove-all-files-pyc-with-recrusive-method.markdown
+++ b/_posts/2016-04-19-remove-all-files-pyc-with-recrusive-method.markdown
@@ -2,7 +2,7 @@
 layout: post
 title:  "Remove all files .pyc with recrusive method"
 date:   2016-04-19 14:39:34 +0700
-categories: python bash
+categories: [python, bash]
 ---
 
 This method simple but important. Example in your project dir is like this:
diff --git a/_posts/2016-04-19-welcome-to-jekyll.markdown b/_posts/2016-04-19-welcome-to-jekyll.markdown
index 8ba4187..2e057b4 100644
--- a/_posts/2016-04-19-welcome-to-jekyll.markdown
+++ b/_posts/2016-04-19-welcome-to-jekyll.markdown
@@ -2,7 +2,7 @@
 layout: post
 title:  "Welcome to Jekyll!"
 date:   2013-02-19 21:28:15 +0700
-categories: jekyll update
+categories: [jekyll, update]
 ---
 You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.