diff --git a/src_main/io_devices/piiodevice.h b/src_main/io_devices/piiodevice.h
index 45129ee1..4bb4b461 100755
--- a/src_main/io_devices/piiodevice.h
+++ b/src_main/io_devices/piiodevice.h
@@ -73,8 +73,8 @@ public:
 
 	//! \brief Characteristics of PIIODevice subclass
 	enum DeviceInfoFlag {
-		Sequential /*! Continuous channel */ = 0x01,
-		Reliable /*! Channel is safe */ = 0x02
+		Sequential /*! Continuous bytestream without datagrams */ = 0x01,
+		Reliable /*! Channel without data errors / corruptions */ = 0x02
 	};
 
 	typedef PIFlags<DeviceOption> DeviceOptions;