diff --git a/hledger/Hledger/Cli/Commands/Register.hs b/hledger/Hledger/Cli/Commands/Register.hs
index 7ea6f0763..59b6bd009 100644
--- a/hledger/Hledger/Cli/Commands/Register.hs
+++ b/hledger/Hledger/Cli/Commands/Register.hs
@@ -71,7 +71,7 @@ registermode = hledgerCommandMode
      )
   ,flagNone ["align-all"] (setboolopt "align-all") "guarantee alignment across all lines (slower)"
   ,flagReq  ["base-url"] (\s opts -> Right $ setopt "base-url" s opts) "URLPREFIX" "in html output, generate links to hledger-web, with this prefix. (Usually the base url shown by hledger-web; can also be relative.)"
-  ,outputFormatFlag ["txt","csv","tsv","json"]
+  ,outputFormatFlag ["txt","csv","tsv","html","fods","json"]
   ,outputFileFlag
   ])
   cligeneralflagsgroups1