diff --git a/Gemfile b/Gemfile
index f316a28..c9d9452 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,4 @@ gem "jekyll", "~> 4.1"
 gem "jekyll-environment-variables"
 gem 'jemoji'
 gem 'rouge'
+gem 'jekyll-last-modified-at'
diff --git a/_layouts/service.html b/_layouts/service.html
index 9be334e..5805804 100644
--- a/_layouts/service.html
+++ b/_layouts/service.html
@@ -8,7 +8,8 @@ layout: default
       <div class="service service-single">
         <h1 class="title">{{page.title}}</h1>
         <div class="content">{{content}}</div>
+        <p>Last modified - {% last_modified_at %}</p>
       </div>
     </div>
   </div>
-</div>
\ No newline at end of file
+</div>