diff --git a/lib/tokyo_api/campact.rb b/lib/tokyo_api/campact.rb
index 2002996..398027d 100644
--- a/lib/tokyo_api/campact.rb
+++ b/lib/tokyo_api/campact.rb
@@ -34,6 +34,10 @@ def user_path(session_id, petition_id:, with_subscription_status: false, require
       path
     end
 
+    def update_prefill_forms_path(session_id)
+      String.new("/#{normalized_base_path}user/#{url_escape(session_id)}/prefill_forms")
+    end
+
     def subscription_status_path(token)
       "/#{normalized_base_path}subscription_status/#{url_escape(token)}"
     end
diff --git a/spec/campact_spec.rb b/spec/campact_spec.rb
index 2f6aab4..2d35ad3 100644
--- a/spec/campact_spec.rb
+++ b/spec/campact_spec.rb
@@ -117,6 +117,12 @@
     end
   end
 
+  describe '#update_prefill_forms_path' do
+    it 'should return relative path to prefill forms endpoint' do
+      expect(subject.campact.update_prefill_forms_path('123abc456')).to eq '/campact/user/123abc456/prefill_forms'
+    end
+  end
+
   describe '#subscription_status_path' do
     subject { TokyoApi::Campact.new }