diff --git a/ChangeLog b/ChangeLog
index 42b2036..4c9472c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,11 +1,12 @@
-2013-12-13  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
+2014-01-08  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
 
         * Version 0.7.0 released
         ========================
 
         Adapt to GammaLib-00-08-00 interface
         ctobssim now only simulates events within ROI and supports
-          all kinds of data space models
+          all kinds of data space models; time slice durations are
+          determined based on source flux
         ctbin now implements LIN and FILE binning algorithms
         ctbin, ctskymap and ctmodel now generate maps with
           increasing longitude to the left
diff --git a/NEWS b/NEWS
index b467940..1f15dc4 100644
--- a/NEWS
+++ b/NEWS
@@ -2,7 +2,7 @@ New Features and Important Changes in ctools 00-07-00
 
 Author(s) : Juergen Knoedlseder
 
-13 December 2013
+8 January 2014
 
 
 1. Introduction
@@ -37,6 +37,11 @@ ctobssim now supports any kind of data space model for background
 simulations, using the abstract mc() method that is now available
 in the GModelData base class.
 
+The time slice duration is now computed from the source flux and
+set so that no more than 1000000 photons will be simulated in a
+given slice. This limits the memory requirements during simulations
+to about 100 MB, yet saving may still need more memory.
+
 
 5. ctselect - CTA event selection
 ---------------------------------