diff --git a/doc/xml-xcb.txt b/doc/xml-xcb.txt
index d47b12c..01f7678 100644
--- a/doc/xml-xcb.txt
+++ b/doc/xml-xcb.txt
@@ -337,6 +337,11 @@ Expressions
 
   This element represents the number of bits set in the expression.
 
+<listelement-ref/>
+
+  This element represents the current list-element when used inside
+  a list-iteration expression such as <sumof>.
+
 Documentation
 -------------