diff --git a/ChangeLog b/ChangeLog
index 8339fe9..2e67c8a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-2015-02-20  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
+2015-02-22  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
 
         * Version 1.0.0 released
         ========================
@@ -7,6 +7,7 @@
         Do not import automatically Python scripts
         Support INDEF/NONE/UNDEF/UNDEFINED parameters in ctselect
         Modify cssens parameter interface (#1426)
+        Add csobsdef script (#1429)
 
 
 2015-01-08  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
diff --git a/NEWS b/NEWS
index 86f4fed..21bdabe 100644
--- a/NEWS
+++ b/NEWS
@@ -2,7 +2,7 @@ New Features and Important Changes in ctools 1.0.0
 
 Author(s) : Juergen Knoedlseder
 
-20 February 2015
+22 February 2015
 
 
 1. Introduction
@@ -104,6 +104,12 @@ now reads a source model that is used for sensitivity estimation.
 This provides more flexibility in the choice of the model for
 sensitivity estimation.
 
+The csobsdef script has been added that allows creation of observation
+definition XML files from colon separated value ASCII files. The
+observation definition files from csobsdef can be fed to ctobssim for
+simulation of multiple pointings in one shot. This enables for example
+survey observations to be simulated in a single ctobssim run.
+
 
 19. caldb
 ---------