diff --git a/[refs] b/[refs]
index c7bfd9395b1a..5b92a153883d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 33e0c249801c6913b2bd102683ab65ab61e12952
+refs/heads/master: a21601463d0e542d20635b835b6c97294571b0a5
diff --git a/trunk/drivers/staging/iio/Documentation/iio_event_monitor.c b/trunk/drivers/staging/iio/Documentation/iio_event_monitor.c
index 22275845fb12..4326e9e764c9 100644
--- a/trunk/drivers/staging/iio/Documentation/iio_event_monitor.c
+++ b/trunk/drivers/staging/iio/Documentation/iio_event_monitor.c
@@ -45,6 +45,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_ANGL] = "angl",
 	[IIO_TIMESTAMP] = "timestamp",
 	[IIO_CAPACITANCE] = "capacitance",
+	[IIO_ALTVOLTAGE] = "altvoltage",
 };
 
 static const char * const iio_ev_type_text[] = {
@@ -92,6 +93,7 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_ANGL:
 	case IIO_TIMESTAMP:
 	case IIO_CAPACITANCE:
+	case IIO_ALTVOLTAGE:
 		break;
 	default:
 		return false;