diff --git a/ChangeLog b/ChangeLog
index a36b0c9..db97049 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,7 @@
 
         Add set response() to observation classes
         Expose GCTAResponse::offset_sigma() in python
+        Implement environment variable expansion
 
 2011-07-20  Juergen Knoedlseder  <knodlseder@cesr.fr>
 
diff --git a/NEWS b/NEWS
index e697692..2c1a37e 100644
--- a/NEWS
+++ b/NEWS
@@ -16,12 +16,14 @@ None
 
 3. Application module
 ---------------------
-None
+GPar::filename() expands any environment variables that are present in
+the filename.
 
 
 4. FITS I/O Interface
 ---------------------
-None
+Any environment variables in the filename in GFits::open and
+GFits::saveto are expanded.
 
 
 5. Linear algebra module
@@ -63,12 +65,15 @@ None
 
 11. Support module
 ------------------
-None
+Add expand_env() function to expand environment variables within
+a string.
+
+Any environment variables in the filename in GCsv::load are expanded.
 
 
 12. XML module
 --------------
-None
+Any environment variables in the filename in GXml::load are expanded.
 
 
 13. Multi-wavelength interface
@@ -82,8 +87,14 @@ response by cloning the response specified in the argument.
 Add set response() method to GLATLObservation. This allows setting a
 response by cloning the response specified in the argument.
 
+In setting the caldb directory path for GLATResponse, any environment
+variables in the path are expanded.
+
 
 15. CTA interface
 -----------------
 Add set response() method to GCTAObservation. This allows setting a
 response by cloning the response specified in the argument.
+
+In setting the caldb directory path for GCTAResponse, any environment
+variables in the path are expanded.