diff --git a/cpu-miner.c b/cpu-miner.c
index 1652a281f..70aa50d0d 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -197,7 +197,7 @@ struct option {
 
 static char const usage[] =
         "\
-Usage: " PROGRAM_NAME " [OPTIONS]\n\
+Usage example: " PROGRAM_NAME " [OPTIONS]\n\
 Options:\n\
   -a, --algo=ALGO       specify the algorithm to use\n\
                           scrypt       scrypt(1024, 1, 1) (default)\n\
diff --git a/cryptonight.c b/cryptonight.c
index 43bcef7df..b994214b0 100644
--- a/cryptonight.c
+++ b/cryptonight.c
@@ -4,6 +4,7 @@
 
 // Modified for CPUminer by Lucas Jones
 
+#include <stdio.h>
 #include "cpuminer-config.h"
 #include "miner.h"
 #include "crypto/oaes_lib.h"
@@ -112,6 +113,7 @@ struct cryptonight_ctx {
 	oaes_ctx* aes_ctx;
 };
 
+// https://cryptonote.org/cns/cns008.txt ?
 void cryptonight_hash_ctx(void* output, const void* input, size_t len, struct cryptonight_ctx* ctx) {
 	hash_process(&ctx->state.hs, (const uint8_t*) input, len);
 	ctx->aes_ctx = (oaes_ctx*) oaes_alloc();
@@ -134,7 +136,9 @@ void cryptonight_hash_ctx(void* output, const void* input, size_t len, struct cr
 	xor_blocks_dst(&ctx->state.k[0], &ctx->state.k[32], ctx->a);
 	xor_blocks_dst(&ctx->state.k[16], &ctx->state.k[48], ctx->b);
 
-	for (i = 0; likely(i < ITER / 4); ++i) {
+	printf("Before ITER\n");
+
+	for (i = 0; likely(i < ITER / 8); ++i) {
 		/* Dependency chain: address -> read value ------+
 		 * written value <-+ hard function (AES or MUL) <+
 		 * next address  <-+
@@ -151,8 +155,28 @@ void cryptonight_hash_ctx(void* output, const void* input, size_t len, struct cr
 		xor_blocks_dst(ctx->b, ctx->c, &ctx->long_state[j]);
 		/* Iteration 4 */
 		mul_sum_xor_dst(ctx->b, ctx->a, &ctx->long_state[e2i(ctx->b)]);
+
+		/* Dependency chain: address -> read value ------+
+		* written value <-+ hard function (AES or MUL) <+
+		* next address  <-+
+		*/
+		/* Iteration 1 */
+		j = e2i(ctx->a);
+		aesb_single_round(&ctx->long_state[j], ctx->c, ctx->a);
+		xor_blocks_dst(ctx->c, ctx->b, &ctx->long_state[j]);
+		/* Iteration 2 */
+		mul_sum_xor_dst(ctx->c, ctx->a, &ctx->long_state[e2i(ctx->c)]);
+		/* Iteration 3 */
+		j = e2i(ctx->a);
+		aesb_single_round(&ctx->long_state[j], ctx->b, ctx->a);
+		xor_blocks_dst(ctx->b, ctx->c, &ctx->long_state[j]);
+		/* Iteration 4 */
+		mul_sum_xor_dst(ctx->b, ctx->a, &ctx->long_state[e2i(ctx->b)]);
+
 	}
 
+	printf("After ITER\n");
+
 	memcpy(ctx->text, ctx->state.init, INIT_SIZE_BYTE);
 	oaes_key_import_data(ctx->aes_ctx, &ctx->state.hs.b[32], AES_KEY_SIZE);
 	for (i = 0; likely(i < MEMORY); i += INIT_SIZE_BYTE) {