diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index 343d26af1dd872a463b841c6c9a78b40841538c3..bb5ad57ed2a29feea0b06003c23c7a3e875a35b7 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -63,6 +63,7 @@ struct dht11 {
 	int				irq;
 
 	struct completion		completion;
+	/* The iio sysfs interface doesn't prevent concurrent reads: */
 	struct mutex			lock;
 
 	s64				timestamp;