diff --git a/tail.1 b/tail.1
index f3e74c5..05ee3db 100644
--- a/tail.1
+++ b/tail.1
@@ -1,4 +1,4 @@
-.Dd February 9, 2015
+.Dd March 5, 2015
 .Dt TAIL 1
 .Os sbase
 .Sh NAME
@@ -7,7 +7,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl f
-.Op Fl c Ar num | Fl n Ar num | Fl N
+.Op Fl c Ar num | Fl n Ar num | Fl Ns Ar num
 .Op Ar file ...
 .Sh DESCRIPTION
 .Nm
@@ -20,11 +20,10 @@ is given,
 reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
-.It Fl c Ar num | Fl n Ar num | Fl N
+.It Fl c Ar num | Fl n Ar num | Fl Ns Ar num
 Display final
 .Ar num
 characters | lines |
-.Ar N
 lines. If
 .Ar num
 begins with '+'
@@ -49,6 +48,6 @@ utility is compliant with the
 .St -p1003.1-2008
 specification.
 .Pp
-The
-.Op Fl N
-flag is an extension to that specification.
+The obsolete
+.Op Fl Ns Ar num
+syntax is an extension to that specification.
diff --git a/tail.c b/tail.c
index dc77a68..2711cc9 100644
--- a/tail.c
+++ b/tail.c
@@ -74,7 +74,7 @@ taketail(FILE *fp, const char *str)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-f] [-c num | -n num] [file ...]\n", argv0);
+	eprintf("usage: %s [-f] [-c num | -n num | -num] [file ...]\n", argv0);
 }
 
 int