diff --git a/man/tkremind.1 b/man/tkremind.1
index 6462b369..d9cf01df 100644
--- a/man/tkremind.1
+++ b/man/tkremind.1
@@ -211,7 +211,8 @@ background reminder pops up.
 .TP
 .B Feed popped-up reminder to command's standard input
 If selected, feeds the text of the reminder to the command described
-above.
+above.  The text of the reminder is prefixed by "HH:MM ", where HH:MM
+is the time of the reminder.
 
 .TP
 .B E-mail reminders here if popup not dismissed