diff --git a/API-README b/API-README
index ee9a7047..450b1aa8 100644
--- a/API-README
+++ b/API-README
@@ -333,7 +333,15 @@ miner.php - an example web page to access the API
 Feature Changelog for external applications using the API:
 
 
-API V1.16
+API V1.17
+
+Modified API commands:
+ 'summary' - add 'Work Utility'
+ 'pools' - add 'Diff1 Shares'
+
+----------
+
+API V1.16 (cgminer v2.6.5)
 
 Added API commands:
  'failover-only'
diff --git a/api.c b/api.c
index e17ded21..2d3781c3 100644
--- a/api.c
+++ b/api.c
@@ -166,7 +166,7 @@ static const char SEPARATOR = '|';
 #define SEPSTR "|"
 static const char GPUSEP = ',';
 
-static const char *APIVERSION = "1.16";
+static const char *APIVERSION = "1.17";
 static const char *DEAD = "Dead";
 static const char *SICK = "Sick";
 static const char *NOSTART = "NoStart";
@@ -1779,6 +1779,7 @@ static void poolstatus(__maybe_unused SOCKETTYPE c, __maybe_unused char *param,
 		root = api_add_uint(root, "Remote Failures", &(pool->remotefail_occasions), false);
 		root = api_add_escape(root, "User", pool->rpc_user, false);
 		root = api_add_time(root, "Last Share Time", &(pool->last_share_time), false);
+		root = api_add_int(root, "Diff1 Shares", &(pool->diff1), false);
 
 		if (isjson && (i > 0))
 			strcat(io_buffer, COMMA);
@@ -1795,7 +1796,7 @@ static void summary(__maybe_unused SOCKETTYPE c, __maybe_unused char *param, boo
 {
 	struct api_data *root = NULL;
 	char buf[TMPBUFSIZ];
-	double utility, mhs;
+	double utility, mhs, work_utility;
 
 #ifdef WANT_CPUMINE
 	char *algo = (char *)(algo_names[opt_algo]);
@@ -1805,6 +1806,7 @@ static void summary(__maybe_unused SOCKETTYPE c, __maybe_unused char *param, boo
 
 	utility = total_accepted / ( total_secs ? total_secs : 1 ) * 60;
 	mhs = total_mhashes_done / total_secs;
+	work_utility = total_diff1 / ( total_secs ? total_secs : 1 ) * 60;
 
 	sprintf(io_buffer, isjson
 		? "%s," JSON_SUMMARY
@@ -1829,6 +1831,7 @@ static void summary(__maybe_unused SOCKETTYPE c, __maybe_unused char *param, boo
 	root = api_add_uint(root, "Remote Failures", &(total_ro), false);
 	root = api_add_uint(root, "Network Blocks", &(new_blocks), false);
 	root = api_add_mhtotal(root, "Total MH", &(total_mhashes_done), false);
+	root = api_add_utility(root, "Work Utility", &(work_utility), false);
 
 	root = print_data(root, buf, isjson);
 	if (isjson)
diff --git a/miner.h b/miner.h
index 396df219..cb090e45 100644
--- a/miner.h
+++ b/miner.h
@@ -662,7 +662,7 @@ extern int opt_rotate_period;
 extern double total_mhashes_done;
 extern unsigned int new_blocks;
 extern unsigned int found_blocks;
-extern int total_accepted, total_rejected;
+extern int total_accepted, total_rejected, total_diff1;;
 extern int total_getworks, total_stale, total_discarded;
 extern unsigned int local_work;
 extern unsigned int total_go, total_ro;