diff --git a/app/controllers/private_api/proteins_controller.rb b/app/controllers/private_api/proteins_controller.rb
index 18b2312..7c5339b 100644
--- a/app/controllers/private_api/proteins_controller.rb
+++ b/app/controllers/private_api/proteins_controller.rb
@@ -44,6 +44,6 @@ def proteins
         }
       end
 
-    // TODO: Common lineage calculation
+    # TODO: Common lineage calculation
   end
 end