diff --git a/docs/firmware b/docs/firmware
new file mode 100644
index 0000000..6bc8b76
--- /dev/null
+++ b/docs/firmware
@@ -0,0 +1,13 @@
+Firmware update:
+
+Copy the firmware file to the dddvb/apps/ directory and
+execute "./flashprog".
+
+The program will try to identify the card version and
+check if it finds the corresponding firmware file.
+It will then prompt you to confirm to proceed
+with the flashing procedure.
+
+After the update the system needs a power cycle.
+
+
diff --git a/docs/iq_samples b/docs/iq_samples
new file mode 100644
index 0000000..f793481
--- /dev/null
+++ b/docs/iq_samples
@@ -0,0 +1,13 @@
+~The Max SX8 can provide IQ samples in real time.
+
+They are 8 bit signed values embedded in TS packets with PID 0x200.
+
+API:
+
+Currently DTV_STREAM_ID is misused.
+
+0x10000000 - symbols (locked and tracked) at symbol rate
+0x20000000 - samples at ADC rate (1550/24=64.583... MHz)
+0x30000000 - samples at symbol rate
+
+Max. sample rate is 64.583333 MHz.
diff --git a/lib/ddzap.c b/lib/ddzap.c
index cf29a41..5990316 100644
--- a/lib/ddzap.c
+++ b/lib/ddzap.c
@@ -414,6 +414,8 @@ int main(int argc, char **argv)
 				delsys = SYS_ISDBC;
 			if (!strcmp(optarg, "ISDBT"))
 				delsys = SYS_ISDBT;
+			if (!strcmp(optarg, "ISDBS"))
+				delsys = SYS_ISDBS;
 			break;
 		case 'p':
 			if (!strcmp(optarg, "h") || !strcmp(optarg, "H"))