diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 0228caaa6741..f9a7461e72b8 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -348,6 +348,7 @@ enum regulator_type {
  * @ramp_delay_table:	Table for mapping the regulator ramp-rate values. Values
  *			should be given in units of V/S (uV/uS). See the
  *			regulator_set_ramp_delay_regmap().
+ * @n_ramp_values:	number of elements at @ramp_delay_table.
  *
  * @enable_time: Time taken for initial enable of regulator (in uS).
  * @off_on_delay: guard time (in uS), before re-enabling a regulator