diff --git a/hledger/hledger.m4.md b/hledger/hledger.m4.md
index 089875cf107..e85d2683d2f 100644
--- a/hledger/hledger.m4.md
+++ b/hledger/hledger.m4.md
@@ -1645,7 +1645,7 @@ You can declare valid tag names with the [tag directive](#tag-directive) and the
 ### Special tags
 
 Some tag names have special significance to hledger.
-There's not much harm in using them yourself, but some could produce an error message, particularly the `date:` tag.
+There's not much harm in using them yourself, but some could produce an error message, particularly the `date:` and `type:` tags.
 They are explained elsewhere, but here is a quick list for reference:
 
 <!-- keep synced with JournalChecks.hs -->