Index: trunk/BNC/bnchelp.html
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 <p><a name="syncport"><h4>3.7.1 Output Port - optional</h4></p>
 <p>
-BNC can produce synchronized observations in binary format on your local host (IP 127.0.0.1) through an IP port. Specify an IP port number here to activate this function. The default is an empty option field, meaning that no binary output is generated.</p>
+BNC can produce synchronized observations in binary format on your local host (IP 127.0.0.1) through an IP port. Specify an IP port number here to activate this function. The default is an empty option field, meaning that no binary output is generated. Note that the sampling interval for the binary output equals the RINEX Observation sampling interval.</p>
 <p>The binary output is a continuous stream in the following order:</p>
 <pre>