utils/split-pieces: Report the correct command-line syntax.

diff --git a/utils/split-pieces b/utils/split-pieces
index 473e2fe..1c79315 100755 (executable)
--- a/utils/split-pieces
+++ b/utils/split-pieces
@@ -5,7 +5,7 @@ from itertools import cycle, izip
 import re as RX
 
 def bad_usage():
-  exit('usage: split-pieces { scaf WD | qf WD/N|WD,WD,... } N N ...')
+  exit('usage: split-pieces { scaf WD | qf P WD/N|WD,WD,... } N N ...')
 
 ARGC = 1
 def getarg(must = True):