diff --git a/doc/owlps.t2t b/doc/owlps.t2t
index 8d97de3..8e22ab6 100644
--- a/doc/owlps.t2t
+++ b/doc/owlps.t2t
@@ -98,7 +98,7 @@ revision number.
 Development point release are numbered with an odd minor version number
 and a mandatory revision number starting at 0, for example:
 - v0.9.0
-- v1.1.0
+- v1.1.2
 - v1.3.3
 
 
@@ -107,7 +107,18 @@ revision number is not mandatory, but it is allowed. For example:
 - v0.8
 - v1.0
 - v1.2
-- v1.2.1 (this one does not exist for real!)
+- v1.2.1 (this one doesn't exist for real!)
+
+
+++ Cross-version compatibility ++
+
+The communication protocol between the elements of the system is
+guaranteed to stay the same across revisions of a given stable branch
+(e.g. mixing modules of versions 1.2, 1.2.1 and 1.2.2 is possible). In
+development branches, the protocol can evolve from one point release to
+the next (e.g.  mixing modules of versions 1.3.0 and 1.3.1 is not
+possible). Changes in communication protocols, libraries' APIs, file
+formats, etc., are pointed out in the ``CHANGELOG`` file.