diff --git a/ChangeLog b/ChangeLog
index 1b641cf..eede89c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,9 @@
-2017-06-27
+2017-06-30
 
         * Bug fix version 1.3.1 released
         ================================
 
+        Fix csresmap significance computation error (#2136)
         Use MigMatrixNoTheta2cut_offaxis and AngularPSF2DEtrue_offaxis histograms to
           compute PSF and energy dispersion IRFs (#2135)
         Properly forward working log file pointer in ctobssim::set_mc_id_names() (#2123)
diff --git a/NEWS b/NEWS
index f41128a..2416830 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 New Features and Important Changes in ctools 1.3.1
 
-27 June 2017
+29 June 2017
 
 
 Introduction
@@ -126,6 +126,10 @@ The csroot2caldb script now uses the MigMatrixNoTheta2cut_offaxis and
 AngularPSF2DEtrue_offaxis ROOT histograms to compute the energy dispersion matrix
 and the PSF shape (#2135).
 
+The csresmap threw an exception for the SIGNIFICANCE method when the model map
+contained zero entries. This has been fixed now by properly handling the case of
+zero entries (#2136).
+
 
 Examples
 --------