message: Add extra comment
diff: @@ -1049,6 +1049,8 @@ where
  T: Into<Gas>,
  {
  if self.is_system_immediate_caller()? {
  + // This avoids charging the user in situation where a system contract calls other system
  + // contract.
  return Ok(());
  }
  self.context.charge_system_contract_call(amount)
  