diff --git a/hledger-lib/Hledger/Reports/MultiBalanceReports.hs b/hledger-lib/Hledger/Reports/MultiBalanceReports.hs
index 0589761e6..38baa02c6 100644
--- a/hledger-lib/Hledger/Reports/MultiBalanceReports.hs
+++ b/hledger-lib/Hledger/Reports/MultiBalanceReports.hs
@@ -60,7 +60,7 @@ newtype MultiBalanceReport =
                      ,MultiBalanceReportTotals
                      )
 type MultiBalanceReportRow    = (AccountName, AccountName, Int, [MixedAmount], MixedAmount, MixedAmount)
-type MultiBalanceReportTotals = ([MixedAmount], MixedAmount, MixedAmount)
+type MultiBalanceReportTotals = ([MixedAmount], MixedAmount, MixedAmount) -- (Totals list, sum of totals, average of totals)
 
 instance Show MultiBalanceReport where
     -- use ppShow to break long lists onto multiple lines