diff --git a/include/linux/i2c-mux-gpio.h b/include/linux/i2c-mux-gpio.h
index a36343a3..4ea1cc7 100644
--- a/include/linux/i2c-mux-gpio.h
+++ b/include/linux/i2c-mux-gpio.h
@@ -21,6 +21,7 @@
  * @values: Array of bitmasks of GPIO settings (low/high) for each
  *	position
  * @n_values: Number of multiplexer positions (busses to instantiate)
+ * @classes: Optional I2C auto-detection classes
  * @gpios: Array of GPIO numbers used to control MUX
  * @n_gpios: Number of GPIOs used to control MUX
  * @idle: Bitmask to write to MUX when idle or GPIO_I2CMUX_NO_IDLE if not used
@@ -30,6 +31,7 @@
 	int base_nr;
 	const unsigned *values;
 	int n_values;
+	const unsigned *classes;
 	const unsigned *gpios;
 	int n_gpios;
 	unsigned idle;