diff --git a/README b/README
index 0fde83a..4a3d7a0 100644
--- a/README
+++ b/README
@@ -54,7 +54,7 @@ The following tools are implemented:
 =*|o nice        .
 #*|o nl          .
 =*|o nohup       .
-     od          -t, -v
+     od          -t
 #*|o paste       .
 =*|x printenv    .
 #*|o printf      .
diff --git a/od.1 b/od.1
index 2fb1311..7900dc7 100644
--- a/od.1
+++ b/od.1
@@ -8,6 +8,7 @@
 .Nm
 .Op Fl A Ar d|o|x|n
 .Op Fl t Ar a|c|d|o|u|x
+.Op Fl v
 .Op Ar file...
 .Sh DESCRIPTION
 .Nm
@@ -27,4 +28,6 @@ he\fIx\fRadecimal | \fIn\fRone.  If unspecified, the default is octal.
 Display the content as n\fIa\fRmed character, \fIc\fRharacter, signed
 \fId\fRecimal, \fIo\fRctal, \fIu\fRnsigned decimal, or
 he\fIx\fRadecimal.  If unspecified, the default is octal.
+.It Fl v
+Always set. Write all input data, including duplicate lines.
 .El
diff --git a/od.c b/od.c
index effe5f5..30031c7 100644
--- a/od.c
+++ b/od.c
@@ -100,7 +100,7 @@ od(FILE *in, char *in_name, FILE *out, char *out_name)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-A d|o|x|n] [-t a|c|d|o|u|x] [file ...]\n", argv0);
+	eprintf("usage: %s [-A d|o|x|n] [-t a|c|d|o|u|x] [-v] [file ...]\n", argv0);
 }
 
 int
@@ -129,6 +129,9 @@ main(int argc, char *argv[])
 			usage();
 		type = s[0];
 		break;
+	case 'v':
+		/* Always set. Use "uniq -f 1 -c" to handle duplicate lines. */
+		break;
 	default:
 		usage();
 	} ARGEND;