diff --git a/ublox/decode.go b/ublox/decode.go
index 3e0ccab..31e52eb 100644
--- a/ublox/decode.go
+++ b/ublox/decode.go
@@ -1,3 +1,6 @@
+// credits to https://github.com/daedaleanai/ublox for basic ubx parsing idea & code
+// missing ubx messages added and code modified by Timo Volkmann
+
 // Package ublox provides methods to encode and decode u-Blox 8 / M8 NMEA and UBX messages
 // as documented in
 //		UBX-13003221 - R20 u-blox 8 / u-blox M8 Receiver description Including protocol specification