diff --git a/ChangeLog b/ChangeLog
index b28d0c8..76dc3f8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-2011-08-09  Juergen Knoedlseder  <knodlseder@cesr.fr>
+2011-09-09  Juergen Knoedlseder  <knodlseder@cesr.fr>
 
         * Version 0.4.11 released
         =========================
@@ -17,6 +17,7 @@
         LM optimizer frees any internally fixed parameter at exit
         Add row and column manipulation methods for FITS tables
         Replace FITS table column methods by access operators
+        Fix bug in GSparseMatrix::cs_transpose
 
 2011-07-20  Juergen Knoedlseder  <knodlseder@cesr.fr>
 
diff --git a/NEWS b/NEWS
index dd29542..6cd7ac2 100644
--- a/NEWS
+++ b/NEWS
@@ -2,7 +2,7 @@ New Features and Important Changes in GammaLib 00-04-11
 
 Author(s) : Juergen Knoedlseder
 
-August 9, 2011
+September 9, 2011
 
 
 1. Introduction
@@ -48,7 +48,8 @@ This allows for more compact and intuitive coding.
 
 5. Linear algebra module
 ------------------------
-None
+Correct a bug in GSparseMatrix::cs_transpose that randomly led to
+segmentation faults and de-allocate correctly the working array.
 
 
 6. Model module