Index: /trunk/BNC/src/bnchelp.html
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--- /trunk/BNC/src/bnchelp.html	(revision 4452)
+++ /trunk/BNC/src/bnchelp.html	(revision 4453)
@@ -2004,4 +2004,8 @@
 </p>
 
+<p>
+Note that BNC outputs a complete list of 'Epoch Header Records' even if no 'Position and Clock Records' are available for certain epochs e.g. because of stream outages. Note further that the 'Number of Epochs' in the first SP3 header record may not be correct because that number is not available when the file is created.
+</p>
+
 <p><a name="uprinex"><h4>3.14.6 RNX File - optional</h4></p>
 <p>