diff --git a/ChangeLog b/ChangeLog
index e15da42..fbd1148 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,10 @@
-2015-12-07  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
+2015-12-16  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
 
         * Version 1.0.0 released
         ========================
 
         Update end-user documentation
+        Adapt to GammaLib interface changs (#1603)
         Implement handling of stacked data in csspec (#1566)
         Resolve Python test problem on El Capitan (#1563)
 
diff --git a/NEWS b/NEWS
index 61afc75..9f18a39 100644
--- a/NEWS
+++ b/NEWS
@@ -2,7 +2,7 @@ New Features and Important Changes in ctools 1.0.0
 
 Author(s) : Juergen Knoedlseder
 
-7 December 2015
+16 December 2015
 
 
 1. Introduction
@@ -27,7 +27,10 @@ None
 
 4. Support model
 ----------------
-None
+Adapt the ctool::create_ebounds() method to the change in the GEbounds
+interface (the extname argument has been removed from the GEbounds::load()
+method and replaced by using the GFilename class to handle extension names
+as part of the file name).
 
 
 5. ctobssim - CTA observation simulation