rename-chain has a mandatary argument, not an optional (Juergen Baumann)
diff --git a/ip6tables.c b/ip6tables.c
index 023acbf..6ee460b 100644
--- a/ip6tables.c
+++ b/ip6tables.c
@@ -119,7 +119,7 @@
 	{ "zero", 2, 0,  'Z' },
 	{ "new-chain", 1, 0,  'N' },
 	{ "delete-chain", 2, 0,  'X' },
-	{ "rename-chain", 2, 0,  'E' },
+	{ "rename-chain", 1, 0,  'E' },
 	{ "policy", 1, 0,  'P' },
 	{ "source", 1, 0, 's' },
 	{ "destination", 1, 0,  'd' },