diff --git a/app/controllers/atdis_controller.rb b/app/controllers/atdis_controller.rb
index 5198aa0a3..8f94533cb 100644
--- a/app/controllers/atdis_controller.rb
+++ b/app/controllers/atdis_controller.rb
@@ -59,5 +59,9 @@ def feed
   end
 
   sig { void }
-  def specification; end
+  def specification
+    return unless show_tailwind_theme?
+
+    redirect_to "https://github.com/openaustralia/atdis/raw/master/docs/ATDIS-1.0.2%20Application%20Tracking%20Data%20Interchange%20Specification%20(v1.0.2).pdf"
+  end
 end
diff --git a/spec/requests/redirects_spec.rb b/spec/requests/redirects_spec.rb
index 5cdf37504..1e70c39c2 100644
--- a/spec/requests/redirects_spec.rb
+++ b/spec/requests/redirects_spec.rb
@@ -34,7 +34,6 @@
 
     it "redirects to the default sort option in the original design" do
       get nearby_application_path(application)
-      # expect(response).not_to be_redirect
       expect(response).to redirect_to nearby_application_path(application, sort: "time")
     end
 
@@ -49,4 +48,17 @@
       expect(response).to redirect_to application_path(application)
     end
   end
+
+  describe "atdis pages" do
+    it "does not redirect the specification page in the original design" do
+      get atdis_specification_path
+      expect(response).not_to be_redirect
+    end
+
+    it "redirects to the pdf document in the new design" do
+      sign_in create(:confirmed_user, tailwind_theme: true)
+      get atdis_specification_path
+      expect(response).to redirect_to "https://github.com/openaustralia/atdis/raw/master/docs/ATDIS-1.0.2%20Application%20Tracking%20Data%20Interchange%20Specification%20(v1.0.2).pdf"
+    end
+  end
 end