diff --git a/app/views/api_settings/index.html.erb b/app/views/api_settings/index.html.erb
index c5bb0955..d3c8227d 100644
--- a/app/views/api_settings/index.html.erb
+++ b/app/views/api_settings/index.html.erb
@@ -118,7 +118,7 @@
       </div>
     </div>
     <div class="text-center">
-      <%= link_to t('open_full_api_reference'), "#{Wabosign::PRODUCT_URL}/docs/api", class: 'btn btn-warning text-base mt-4 px-8', target: '_blank', rel: 'noopener' %>
+      <%= link_to t('open_full_api_reference'), "#{Wabosign::GITHUB_URL}/tree/master/docs/api", class: 'btn btn-warning text-base mt-4 px-8', target: '_blank', rel: 'noopener' %>
     </div>
   </div>
 </div>