--- a/doc/3.18.rst	Tue Jan 07 17:45:48 2014 +0100
+++ b/doc/3.18.rst	Wed Jan 08 12:09:44 2014 +0100
@@ -1,6 +1,9 @@
 What's new in CubicWeb 3.18?
 ============================
 
+The migration script does not handle sqlite nor mysql instances.
+
+
 New functionalities
 --------------------
 
@@ -28,6 +31,10 @@
   may have some consequences for applications that do low-level database
   manipulations or at times disable (some) hooks.
 
+* `unique together` constraints (multi-columns unicity constraints)
+  get a `name` attribute that maps the CubicWeb contraint entities to
+  corresponding backend index.
+
 
 Deprecation
 ---------------------