diff --git a/drivers/iio/proximity/rfd77402.c b/drivers/iio/proximity/rfd77402.c
index eec336bed424..0be49a6e401d 100644
--- a/drivers/iio/proximity/rfd77402.c
+++ b/drivers/iio/proximity/rfd77402.c
@@ -77,9 +77,13 @@ static const struct {
 	{RFD77402_HFCFG_3,	0x45d4},
 };
 
+/**
+ * struct rfd77402_data - device-specific data for the RFD77402 sensor
+ * @client: I2C client handle
+ * @lock: mutex to serialize sensor reads
+ */
 struct rfd77402_data {
 	struct i2c_client *client;
-	/* Serialize reads from the sensor */
 	struct mutex lock;
 };