diff --git a/documentation/ref-manual/technical-details.xml b/documentation/ref-manual/technical-details.xml
index 2b962509c1..b489f02c9d 100644
--- a/documentation/ref-manual/technical-details.xml
+++ b/documentation/ref-manual/technical-details.xml
@@ -780,7 +780,8 @@
                 of <filename><link linkend='var-S'>S</link></filename>.
             </para>
             <para>
-                Note that this variable is mandatory for all recipes, unless the
+                Note that <filename>LIC_FILES_CHKSUM</filename> variable is 
+                mandatory for all recipes, unless the 
                 <filename>LICENSE</filename> variable is set to "CLOSED".
             </para>
         </section>