diff --git a/host/main.c b/host/main.c
index 21d82ba..8ab7d2d 100644
--- a/host/main.c
+++ b/host/main.c
@@ -97,6 +97,10 @@ static int process_usb_msg(uint8_t *buf, int len)
 			apdu_out_cb(payload, payload_len, NULL);
 			break;
 		}
+		if (sh->flags & SIMTRACE_FLAG_PPS_FIDI) {
+			printf("PPS(Fi=%u/Di=%u) ",
+				sh->res[0], sh->res[1]);
+		}
 		/* everything else goes into APDU splitter */
 		apdu_split_in(as, payload, payload_len);
 #if 0
diff --git a/host/simtrace_usb.h b/host/simtrace_usb.h
index c020093..b8b62d3 100644
--- a/host/simtrace_usb.h
+++ b/host/simtrace_usb.h
@@ -20,5 +20,6 @@ enum simtrace_usb_msgt {
 /* flags for MSGT_DATA */
 #define SIMTRACE_FLAG_ATR		0x01	/* ATR immediately after reset */
 #define SIMTRACE_FLAG_WTIME_EXP		0x04	/* work waiting time expired */
+#define SIMTRACE_FLAG_PPS_FIDI		0x08	/* Fi/Di values in res[2] */
 
 #endif /* SIMTRACE_USB_H */