Correct -a command line help.
diff --git a/cpu-miner.c b/cpu-miner.c
index 052c3fe..9690d29 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -63,7 +63,7 @@ static struct option_help options_help[] = {
"(-h) Display this help text" },
{ "algo",
- "(-a) Specify sha256 implementation:\n"
+ "(-a XXX) Specify sha256 implementation:\n"
"\tc\t\tLinux kernel sha256, implemented in C"
#ifdef __SSE__
"\n\t4way\t\ttcatm's 4-way SSE2 implementation"