--- a/relpipe-data/specification.xml	Sun Dec 02 22:48:32 2018 +0100
+++ b/relpipe-data/specification.xml	Tue Dec 04 17:27:24 2018 +0100
@@ -113,6 +113,17 @@
 			Particular implementation might offer also additional features like chart drawing or simple statistics (sum, max, min, avg, percentiles etc.)
 		</p>
 		
+		<h3>relpipe-out-nullbyte</h3>
+		
+		<p>
+			A tool that converts relational data to a list of null-byte (<code>\0</code>) separated values.
+			Makes sense only for a single relation because boundaries between relations will be lost if there are more of them.
+			Also attribute names and types are lost by default.
+		</p>
+		<p>
+			Is suitable for passing a single relation to <code>xargs -0 -nX</code> (where X is the attribute count)
+			or other command that accepts values separated by a null-byte.
+		</p>
 		
 		<h3>relpipe-out-xml</h3>