diff --git a/AUTHORS b/AUTHORS
index 1f8f45a..4b6cdc1 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -2,6 +2,7 @@ Johan Bregeon (johan.bregeon@lupm.in2p3.fr)
 Rolf Buehler (rolf.buehler@desy.de)
 Jean-Baptiste Cayrou (cayrou@etud.insa-toulouse.fr)
 Christoph Deil (Christoph.Deil@mpi-hd.mpg.de)
+Leonardo Di Venere (leonardo.divenere@ba.infn.it)
 Florent Forest (florent.forest@isae.fr)
 Lucie Gerard (lgerard@wgs18.zeuthen.desy.de)
 Maria Haupt (maria.haupt@desy.de)
diff --git a/ChangeLog b/ChangeLog
index 97ae5a7..7f305e8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,9 @@
-2017-04-10
+2017-04-11
 
         * Version 1.3.0 released
         ========================
 
+        Add ctprob tool (#1991)
         ctlike stores covariance matrix in either CSV or FITS format (#1863)
         Use correct ROOT histograms in csroot2caldb
         Implement regression scheme in cssens and remove num_avg parameter (#1989)
diff --git a/NEWS b/NEWS
index d0a8c2d..d41c52c 100644
--- a/NEWS
+++ b/NEWS
@@ -133,6 +133,15 @@ cterror - Likelihood profile error computation
 None
 
 
+ctprob - Event probability computation
+--------------------------------------
+The ctprob tool has been added that computates for each event the probability
+that the event originates from a given model component. The tool takes on input
+either an event list or an observation definition XML file. It appends to each
+event list a column for each model component that will contain the probability
+that the event originates from that component (#1991).
+
+
 cscripts
 --------
 The csebins script has been added that generates an energy boundaries