diff --git a/ps/ps.1 b/ps/ps.1
index 2bb360ea..97afbea5 100644
--- a/ps/ps.1
+++ b/ps/ps.1
@@ -921,7 +921,7 @@ t	tty	the device number of the controlling tty
 T	start_time	time process was started
 U	uid	user ID number
 u	user	user name
-v	vsize	total VM size in kB
+v	vsize	total VM size in KiB
 y	priority	kernel scheduling priority
 .\"K	stime	system time (conflict, system vs. start time)
 .TE
diff --git a/vmstat.c b/vmstat.c
index 2b1e9a91..9fca4ef4 100644
--- a/vmstat.c
+++ b/vmstat.c
@@ -783,7 +783,7 @@ int main(int argc, char *argv[])
 			default:
 				xerrx(EXIT_FAILURE,
 				     /* Translation Hint: do not change argument characters */
-				     _("-S requires k, K, m or M (default is kb)"));
+				     _("-S requires k, K, m or M (default is KiB)"));
 			}
 			szDataUnit[0] = optarg[0];
 			break;