diff -r c079bc35b9b8 -r 46042297e0d6 relpipe-data/specification.xml
--- a/relpipe-data/specification.xml	Sun Dec 02 17:12:34 2018 +0100
+++ b/relpipe-data/specification.xml	Sun Dec 02 20:47:38 2018 +0100
@@ -129,6 +129,15 @@
 			This OpenDocument output can be opened in tools like LibreOffice and further processed (add charts, calculations etc.).
 		</p>
 		
+		<h3>relpipe-tr-validator</h3>
+		
+		<p>
+			A tool that behaves like <code>cat</code>, <code>dd</code> or <code>pv</code> commands i.e. reads data from STDIN and outputs the same data on STDOUT.
+			But compared to these tools, data are parsed and then converted back to the <m:name/> format.
+			Thus if the input was not in this format, the process fails (exit code != 0).
+			Errors (if any) are reported on STDERR.
+		</p>
+		
 	</text>
 
 </stránka>