diff --git a/hledger-lib/Hledger/Data/JournalChecks.hs b/hledger-lib/Hledger/Data/JournalChecks.hs
index a5a3ba3a9..3b10b85cd 100644
--- a/hledger-lib/Hledger/Data/JournalChecks.hs
+++ b/hledger-lib/Hledger/Data/JournalChecks.hs
@@ -204,9 +204,11 @@ builtinTags = [
   -- optionally generated on periodic transactions and auto postings
   ,"generated-transaction"
   ,"generated-posting"
+  ,"modified"
   -- used internally, not shown (but queryable)
   ,"_generated-transaction"
   ,"_generated-posting"
+  ,"_modified"
   ,"_conversion-matched"
   ]