diff -r c78dfa0603c9 -r c079bc35b9b8 relpipe-data/implementation.xml
--- a/relpipe-data/implementation.xml	Sun Dec 02 02:18:54 2018 +0100
+++ b/relpipe-data/implementation.xml	Sun Dec 02 17:12:34 2018 +0100
@@ -46,7 +46,12 @@
 			It can be also hacked using <code>LD_PRELOAD</code>.
 		</p>
 		
-		
+		<p>
+			The helper libraries and constants are designed as <em>header-only</em> (they are compiled into a program/library instead of dynamic linking).
+			They do not provide any public API and are used only internally by other <code>relpipe-*</code> tools and libraries.
+			Because they are maintained by the same team of developers, this usage cause no harm.
+			If any change in this <em>header-only</em> library is needed, just recompile whole shared library and plug it in given existing program.
+		</p>
 		
 	</text>