add usage for batch to tc.
diff --git a/tc/tc.c b/tc/tc.c
index f007225..793eab2 100644
--- a/tc/tc.c
+++ b/tc/tc.c
@@ -180,6 +180,7 @@
 static void usage(void)
 {
 	fprintf(stderr, "Usage: tc [ OPTIONS ] OBJECT { COMMAND | help }\n"
+			"       tc [-force] -batch file\n"
 	                "where  OBJECT := { qdisc | class | filter | action }\n"
 	                "       OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] | -b[atch] [file] }\n");
 }