diff --git a/keyboard/hhkb_rn42/rn42/rn42.c b/keyboard/hhkb_rn42/rn42/rn42.c
index 3fcd64ad..e7d8ba45 100644
--- a/keyboard/hhkb_rn42/rn42/rn42.c
+++ b/keyboard/hhkb_rn42/rn42/rn42.c
@@ -86,6 +86,11 @@ void rn42_cts_lo(void)
     PORTD &= ~(1<<5);
 }
 
+bool rn42_linked(void)
+{
+    return PINF&(1<<6);
+}
+
 
 static uint8_t keyboard_leds(void) { return 0; }
 
diff --git a/keyboard/hhkb_rn42/rn42/rn42.h b/keyboard/hhkb_rn42/rn42/rn42.h
index 4189733b..72cbb2d7 100644
--- a/keyboard/hhkb_rn42/rn42/rn42.h
+++ b/keyboard/hhkb_rn42/rn42/rn42.h
@@ -14,5 +14,6 @@ void rn42_disconnect(void);
 bool rn42_rts(void);
 void rn42_cts_hi(void);
 void rn42_cts_lo(void);
+bool rn42_linked(void);
 
 #endif
diff --git a/keyboard/hhkb_rn42/rn42/rn42_task.c b/keyboard/hhkb_rn42/rn42/rn42_task.c
index 2bc1c7fd..437dd46f 100644
--- a/keyboard/hhkb_rn42/rn42/rn42_task.c
+++ b/keyboard/hhkb_rn42/rn42/rn42_task.c
@@ -162,8 +162,10 @@ bool command_extra(uint8_t code)
             xprintf("protocol: %s\n", (host_get_driver() == &rn42_driver) ? "RN-42" : "LUFA");
             xprintf("force_usb: %X\n", force_usb);
             xprintf("rn42_autoconnecting(): %X\n", rn42_autoconnecting());
+            xprintf("rn42_linked(): %X\n", rn42_linked());
             xprintf("rn42_rts(): %X\n", rn42_rts());
             xprintf("config_mode: %X\n", config_mode);
+            xprintf("VBUS: %X\n", USBSTA&(1<<VBUS));
             return true;
         case KC_B:
             // battery monitor