diff --git a/doc/openocd.texi b/doc/openocd.texi
index 8ebb468d4..1e9f80dce 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -2440,7 +2440,7 @@ dict get [adapter list] ftdi
 @deffn {Config Command} {adapter gpio [ @
     @option{tdo} | @option{tdi} | @option{tms} | @option{tck} | @option{trst} | @
     @option{swdio} | @option{swdio_dir} | @option{swclk} | @option{srst} | @
-    @option{led} @
+    @option{led} | @option{user0} @
     [ @
         gpio_number | @option{-chip} chip_number | @
         @option{-active-high} | @option{-active-low} | @
@@ -2460,6 +2460,7 @@ JTAG transport signals
 @item @option{swdio_dir}: optional swdio buffer control signal
 @item @option{srst}: system reset signal
 @item @option{led}: optional activity led
+@item @option{user0}: optional, user-specific signal
 
 @end itemize
 
diff --git a/src/jtag/adapter.c b/src/jtag/adapter.c
index 07560f0db..87c65719c 100644
--- a/src/jtag/adapter.c
+++ b/src/jtag/adapter.c
@@ -65,6 +65,7 @@ static const struct gpio_map {
 	[ADAPTER_GPIO_IDX_TRST] = { "trst", ADAPTER_GPIO_DIRECTION_OUTPUT, false, true, true },
 	[ADAPTER_GPIO_IDX_SRST] = { "srst", ADAPTER_GPIO_DIRECTION_OUTPUT, false, true, true },
 	[ADAPTER_GPIO_IDX_LED] = { "led", ADAPTER_GPIO_DIRECTION_OUTPUT, true, true, true },
+	[ADAPTER_GPIO_IDX_USER0] = { "user0", ADAPTER_GPIO_DIRECTION_BIDIRECTIONAL, true, true, true },
 };
 
 static int adapter_config_khz(unsigned int khz);
diff --git a/src/jtag/adapter.h b/src/jtag/adapter.h
index ed58fe5aa..d76ea5e32 100644
--- a/src/jtag/adapter.h
+++ b/src/jtag/adapter.h
@@ -60,6 +60,7 @@ enum adapter_gpio_config_index {
 	ADAPTER_GPIO_IDX_SWCLK,
 	ADAPTER_GPIO_IDX_SRST,
 	ADAPTER_GPIO_IDX_LED,
+	ADAPTER_GPIO_IDX_USER0,
 	ADAPTER_GPIO_IDX_NUM, /* must be the last item */
 };