diff --git a/_config.yml b/_config.yml
index c75c738..68c2f3c 100644
--- a/_config.yml
+++ b/_config.yml
@@ -10,5 +10,15 @@ theme: jekyll-theme-classless-simple
 header_pages:
 - about.md
 - view-on-github.md
+giscus:
+  repo: toshimaru/jekyll-theme-classless-simple
+  repo-id: R_kgDOGifmdQ
+  category-id: DIC_kwDOGifmdc4CO8Hz
+  # category: Announcements
+  # lang: en
+  # reactions-enabled: 1
+  # emit-metadata: 0
+  # input-position: bottom
+  # theme: light
 plugins:
 - jekyll-redirect-from
diff --git a/_layouts/post.html b/_layouts/post.html
index 59468ce..7863363 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -21,4 +21,21 @@ <h1 class="post-title" itemprop="name headline">{{ page.title | escape }}</h1>
   <div class="post-content" itemprop="articleBody">
     {{ content }}
   </div>
+
+  {%- if site.giscus.repo -%}
+  <script src="https://giscus.app/client.js"
+          data-repo="{{ site.giscus.repo }}"
+          data-repo-id="{{ site.giscus.repo-id }}"
+          data-category="{{ site.giscus.category | default: 'Announcements' }}"
+          data-category-id="{{ site.giscus.category-id }}"
+          data-mapping="{{ site.giscus.mapping | default: 'pathname' }}"
+          data-reactions-enabled="{{ site.giscus.reactions-enabled | default: '1' }}"
+          data-emit-metadata="{{ site.giscus.emit-metadata | default: '0' }}"
+          data-input-position="{{ site.giscus.input-position | default: 'bottom' }}"
+          data-theme="{{ site.giscus.theme | default: 'light' }}"
+          data-lang="{{ site.giscus.lang | default: 'en' }}"
+          crossorigin="anonymous"
+          async>
+  </script>
+  {%- endif -%}
 </div>