diff --git a/DESCRIPTION b/DESCRIPTION
index 24773b26..4b63ead1 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: PopED
 Type: Package
 Title: Population (and Individual) Optimal Experimental Design
-Version: 0.3.0.9012
+Version: 0.3.1
 Depends:
     R (>= 2.14)
 Imports:
diff --git a/NEWS b/NEWS
index ba8fc408..ca817cff 100644
--- a/NEWS
+++ b/NEWS
@@ -1,18 +1,32 @@
 PopED News/Changelog
 
-PopED 0.3.0.9000
+PopED 0.3.1
 ===========
 
+* Added a vignette to introduce PopED!
+
+* Improved optimization with `poped_optim`, plus all example scripts now running with `poped_optim`.
+
+* Update to more easily allow discrete optimization of xt and a variables.  See the example scripts.
+
+* Added a summary method for the results of `poped_optim`.  Just use `summary(output)`.
+
+* changed handling of seed numbers in optimizations.
+
+* more robust handling of non-population models
+
+* more natural handling of NA values in design vectors
+
 * NAMESPACE: removed ggplot2 from "Depends" and added to "Imports" 
 
 * Added mean line to efficiency plots.
 
-* Update to error handling for Laplace approximation to ED objective function. 
-
-* Update to more easily allow discrete optimization of xt and a variables.
+* Update to computation and error handling for Laplace approximation to ED objective function. 
 
 * Added more intuitive cost function input.  See examples in `?poped_optim`
 
+* Various small changes and bug fixes.
+
 
 PopED 0.3.0
 ===========
diff --git a/cran-comments.md b/cran-comments.md
index c5dd6287..2718d0bc 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -1,7 +1,7 @@
 ## Test environments
-* local OS X (10.11.2) install, R 3.2.3
-* ubuntu 12.04 (on travis-ci), R 3.2.3
-* win-builder (devel and release)
+* local OS X (10.12) install, R 3.3.1
+* ubuntu 12.04 (on travis-ci), R 3.3.1
+* win-builder (release)
 
 ## R CMD check results
 There were no ERRORs, WARNINGs or NOTEs.