1 files changed, 18 insertions, 6 deletions

diff --git a/usr.bin/ncal/ncal.1 b/usr.bin/ncal/ncal.1
index f7f2187065c6..d9973c22790c 100644
--- a/usr.bin/ncal/ncal.1
+++ b/usr.bin/ncal/ncal.1
@@ -117,12 +117,6 @@ Britain and her colonies switched to the Gregorian Calendar.
 Print the number of the week below each week column.
 .It Fl y
 Display a calendar for the specified year.
-.It Fl b
-Switch to backwards compatibility mode (for debugging).
-.It Fl d Ar yyyy-mm-dd
-Use
-.Ar yyyy-mm-dd
-as the current date (for debugging of highlighting).
 .It Fl 3
 Display the previous, current and next month surrounding today.
 .It Fl A Ar number
@@ -133,6 +127,16 @@ of months after the current month.
 Display the
 .Ar number
 of months before the current month.
+.It Fl b
+Switch to backwards compatibility mode (for debugging).
+.It Fl d Ar yyyy-mm
+Use
+.Ar yyyy-mm
+as the current date (for debugging of date selection).
+.It Fl H Ar yyyy-mm-dd
+Use
+.Ar yyyy-mm-dd
+as the current date (for debugging of highlighting).
 .El
 .Pp
 A single parameter specifies the year (1\(en9999) to be displayed;
@@ -148,6 +152,14 @@ year default to those of the current system clock and time zone (so
 will display a calendar for the month of August in the current
 year).
 .Pp
+Not all options can be used together. For example
+.Dq Li -3 -A 2 -B 3 -y -m 7
+would mean:
+show me the three months around the seventh month, three before
+that, two after that and the whole year.
+.Nm ncal
+will warn about these combinations.
+.Pp
 A year starts on January 1.
 .Sh SEE ALSO
 .Xr calendar 3 ,