diff --git a/libraries/chain/db_init.cpp b/libraries/chain/db_init.cpp
index 538808dd..72841afe 100644
--- a/libraries/chain/db_init.cpp
+++ b/libraries/chain/db_init.cpp
@@ -263,9 +263,6 @@ void database::initialize_indexes()
    acnt_index->add_secondary_index<account_referrer_index>();
 
    add_index< primary_index<committee_member_index, 8> >(); // 256 members per chunk
-
-   // Note: Do not create secondary_index if you will need to create an 
-   // operation to remove associated object.
    add_index< primary_index<son_index> >();
    add_index< primary_index<witness_index, 10> >(); // 1024 witnesses per chunk
    add_index< primary_index<limit_order_index > >();
diff --git a/libraries/db/include/graphene/db/index.hpp b/libraries/db/include/graphene/db/index.hpp
index 7554955e..1bc593f4 100644
--- a/libraries/db/include/graphene/db/index.hpp
+++ b/libraries/db/include/graphene/db/index.hpp
@@ -402,18 +402,6 @@ namespace graphene { namespace db {
             DerivedIndex::remove(obj);
          }
 
-         // Note: Implementing insert function here will break the
-         // bookie_plugin functionality as it was implemented assuming no undo required.
-         // virtual const object& insert( object&& obj )override
-         // {
-         //     const auto& res = DerivedIndex::insert(std::move(obj));
-         //     if (object_type_id() != graphene::)
-         //     for( const auto& item : _sindex )
-         //        item->object_inserted( res );
-         //     on_add(res);
-         //     return res;
-         // }
-
          virtual void modify( const object& obj, const std::function<void(object&)>& m )override
          {
             save_undo( obj );