diff --git a/lib/nmea2000esp32/readme.txt b/lib/nmea2000esp32/readme.txt
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+++ b/lib/nmea2000esp32/readme.txt
@@ -0,0 +1,3 @@
+forked from https://github.com/ttlappalainen/NMEA2000_esp32
+with some error handling additions
+based on https://www.esp32.com/viewtopic.php?t=5010
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