diff --git a/doc/man/timew.1.in b/doc/man/timew.1.in
index 260f8c30..aa632e5e 100644
--- a/doc/man/timew.1.in
+++ b/doc/man/timew.1.in
@@ -160,6 +160,12 @@ Determines whether harmful operations require interactive confirmation.
 May be overridden by the ':yes' hint.
 Default value is 'yes'.
 
+.TP
+.B debug = off
+Determines whether diagnostic debugging information is shown.
+Useful for troubleshooting, but not for general use.
+Default value is 'off'.
+
 .TP
 .B report.day.24hours = off
 .br