diff --git a/doc/dom.txt b/doc/dom.txt
index c0e50bae..99fe4eb3 100644
--- a/doc/dom.txt
+++ b/doc/dom.txt
@@ -45,6 +45,8 @@ All DOM references have this form:
   dom.gap.today
   ...
 
+  rc.<name>
+
 - The above needs to support overlapping tags.
 
 - The above does not support totals, as this would turn DOM references into a