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diff --git a/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs b/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs
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+What:           /sys/bus/iio/devices/triggerX/trigger_now
+KernelVersion:  2.6.38
+Contact:        linux-iio@vger.kernel.org
+Description:
+                This file is provided by the iio-trig-sysfs stand-alone trigger
+                driver. Writing this file with any value triggers an event
+                driven driver, associated with this trigger, to capture data
+                into an in kernel buffer. This approach can be valuable during
+                automated testing or in situations, where other trigger methods
+                are not applicable. For example no RTC or spare GPIOs.
+                X is the IIO index of the trigger.