--- cci/usr/src/man/man8/dump.8	2019/07/28 12:24:19	1.1
+++ cci/usr/src/man/man8/dump.8	2019/07/28 12:27:14	1.1.1.2
@@ -78,6 +78,16 @@ is taken from the next
 This is used in calculating the amount of tape
 used per reel. The default is 1600.
 .TP 5
+.B b
+The block size 
+of the tape, expressed in 1K byte units,
+is taken from the next 
+.I argument.
+The default is 10 (10K bytes)
+This block size will be stored in the header so that
+.IR Restore (8)
+will use it to read the tape correctly.
+.TP 5
 .B W
 .I Dump
 tells the operator what file systems need to be dumped.