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-rw-r--r--src/include/gpiolib.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/gpiolib.h b/src/include/gpiolib.h
index 850a661559..436f26ac04 100644
--- a/src/include/gpiolib.h
+++ b/src/include/gpiolib.h
@@ -31,6 +31,10 @@ typedef unsigned gpio_t;
* bit fields, each representing one GPIO value, or a number where each GPIO is
* included multiplied by 3^gpio_num, resulting in a true tertiary value.
*
+ * gpio[]: pin positions to read. little-endian (less significant value first).
+ * num_gpio: number of pins to read.
+ * tertiary: 1: pins are interpreted as a quad coded tertiary.
+ * 0: pins are interpreted as a set of two bit fields.
*/
int gpio_get_in_tristate_values(gpio_t gpio[], int num_gpio, int tertiary);