--- /sys/src/cmd/gzip/unzip.c	Fri May  9 20:28:53 2008
+++ /sys/src/cmd/gzip/unzip.c	Thu Feb 27 20:15:19 2014
@@ -52,7 +52,7 @@
 static void
 usage(void)
 {
-	fprint(2, "usage: unzip [-tsv] [-f zipfile] [file ...]\n");
+	fprint(2, "usage: unzip [-cistTvD] [-f zipfile] [file ...]\n");
 	exits("usage");
 }