--- a/doc/book/en/annexes/rql/language.rst	Fri Apr 16 14:39:42 2010 +0200
+++ b/doc/book/en/annexes/rql/language.rst	Fri Apr 16 16:40:25 2010 +0200
@@ -373,3 +373,15 @@
 
         DELETE X friend Y WHERE X is Person, X name 'foo'
 
+Virtual RQL relations
+~~~~~~~~~~~~~~~~~~~~~
+
+Those relations may only be used in RQL query and are not actual
+attributes of your entities.
+
+* `has_text`: relation to use to query the full text index (only for
+  entities having fulltextindexed attributes).
+
+* `identity`: relation to use to tell that a RQL variable should be
+  the same as another (but you've to use two different rql variables
+  for querying purpose)