1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/staging/pi433/rf69_enum.h b/drivers/staging/pi433/rf69_enum.h
index fbf56fcf5fe8..b33a33a85d3b 100644
--- a/drivers/staging/pi433/rf69_enum.h
+++ b/drivers/staging/pi433/rf69_enum.h
@@ -110,12 +110,24 @@ enum fifo_fill_condition {
 };
 
 enum packet_format {
+	/*
+	 * Used when the size of payload is fixed in advance. This mode of
+	 * operation may be of interest to minimize RF overhead by 1 byte as
+	 * no length byte field is required
+	 */
 	packet_length_fix,
+	/*
+	 * Used when the size of payload isn't known in advance. It requires the
+	 * transmitter to send the length byte in each packet so the receiver
+	 * would know how to operate properly
+	 */
 	packet_length_var
 };
 
 enum tx_start_condition {
+	/* the number of bytes in the FIFO exceeds FIFO_THRESHOLD */
 	fifo_level,
+	/* at least one byte in the FIFO */
 	fifo_not_empty
 };