diff --git a/Gemfile b/Gemfile
index 8312bd2..8d7bad0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ group :jekyll_plugins do
   gem 'jekyll-seo-tag'
   gem 'jekyll-sitemap'
   gem 'jekyll-titles-from-headings'
+  gem 'jekyll-toc'
   gem 'jemoji'
 end
 # themes
diff --git a/Gemfile.lock b/Gemfile.lock
index ba56c3c..ca16876 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -141,6 +141,8 @@ GEM
       jekyll-seo-tag (~> 2.0)
     jekyll-titles-from-headings (0.5.1)
       jekyll (~> 3.3)
+    jekyll-toc (0.9.1)
+      nokogiri (~> 1.8)
     jekyll-watch (2.1.2)
       listen (~> 3.0)
     jemoji (0.10.2)
@@ -252,6 +254,7 @@ DEPENDENCIES
   jekyll-theme-tactile
   jekyll-theme-time-machine
   jekyll-titles-from-headings
+  jekyll-toc
   jemoji
   kramdown
   liquid