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-rw-r--r--Documentation/gpio/driver.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
index 23b751a10d7b..31e0b5db55d8 100644
--- a/Documentation/gpio/driver.txt
+++ b/Documentation/gpio/driver.txt
@@ -124,7 +124,8 @@ symbol:
* gpiochip_set_chained_irqchip(): sets up a chained irq handler for a
gpio_chip from a parent IRQ and passes the struct gpio_chip* as handler
data. (Notice handler data, since the irqchip data is likely used by the
- parent irqchip!) This is for the chained type of chip.
+ parent irqchip!) This is for the chained type of chip. This is also used
+ to set up a nested irqchip if NULL is passed as handler.
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