diff --git a/bin/dd/args.c b/bin/dd/args.c
index 21e4aa1cb089..1cbf3b374cf1 100644
--- a/bin/dd/args.c
+++ b/bin/dd/args.c
@@ -383,6 +383,14 @@ postfix_to_mult(const char expr)
 	case 'g':
 		mult = 1 << 30;
 		break;
+	case 'T':
+	case 't':
+		mult = (uintmax_t)1 << 40;
+		break;
+	case 'P':
+	case 'p':
+		mult = (uintmax_t)1 << 50;
+		break;
 	case 'W':
 	case 'w':
 		mult = sizeof(int);
diff --git a/bin/dd/dd.1 b/bin/dd/dd.1
index 0908642dd1cf..4047cdca57f5 100644
--- a/bin/dd/dd.1
+++ b/bin/dd/dd.1
@@ -32,7 +32,7 @@
 .\"     @(#)dd.1	8.2 (Berkeley) 1/13/94
 .\" $FreeBSD$
 .\"
-.Dd August 28, 2014
+.Dd February 4, 2016
 .Dt DD 1
 .Os
 .Sh NAME
@@ -332,10 +332,13 @@ If the number ends with a
 .Dq Li k ,
 .Dq Li m ,
 .Dq Li g ,
+.Dq Li t ,
+.Dq Li p ,
 or
 .Dq Li w ,
 the
-number is multiplied by 512, 1024 (1K), 1048576 (1M), 1073741824 (1G)
+number is multiplied by 512, 1024 (1K), 1048576 (1M), 1073741824 (1G),
+1099511627776 (1T), 1125899906842624 (1P)
 or the number of bytes in an integer, respectively.
 Two or more numbers may be separated by an
 .Dq Li x