diff --git a/doc/lib.m4 b/doc/lib.m4
index d613e8006..1c9e60372 100644
--- a/doc/lib.m4
+++ b/doc/lib.m4
@@ -156,6 +156,15 @@ m4_define({{_reportingoptions_}}, {{
 : convert amounts to their market value on the report end date
 (using the most recent applicable [market price](journal.html#market-prices), if any)
 
+`--forecast`
+: generate forecast transactions from [periodic transaction]((journal.html#periodic-transactions) rules.
+Each periodic transaction rule will generate [forecast transactions](budgeting-and-forecasting.html#forecasting),
+beginning the day after the last recorded journal transaction,
+and ending 6 months from today, or at the specified report end date.
+
+`--auto`
+: apply [automated posting rules](journal.html#automated-posting-rules) to modify transactions where applicable (can combine with --forecast).
+
 When a reporting option appears more than once in the command line, the last one takes precedence.
 
 Some reporting options can also be written as [query arguments](#queries).