diff --git a/raw2csv/README.txt b/raw2csv/README.txt
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+raw2csv.py:
+
+Original version from chadjoan in the Zeo developer's forum:
+http://blog.myzeo.com/forum/zeo-raw-data-library/recording-real-time-data-into-csv-files-and-wake-when-light/
+
+Uses ZeoRawData-2.0 from Zeo, also modified
+
+Modifications:
+Reads data from file instead of serial port.
+
+raw2csv.py [-f] filename
+-f:  "follow" filename;  wait for more data and keep reading until
+     ctrl-c. (without this flag, exit when end-of-file)
+