diff --git a/NEWS b/NEWS
index 88cf5d3..b31f2ad 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,9 @@
 
 
+lvec version 0.2.1
+===============================================================================
+* Fixes bugs with negative indices resulting un undefined behaviour. 
+
 lvec version 0.2.0
 ===============================================================================
 * Rewrote internals to use Rcpp. Packages linking to lvec will need to be 
diff --git a/cran-comments.md b/cran-comments.md
index 670915e..304efc5 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -1,5 +1,7 @@
 
 
+Update to previous submission, fixing warnings in examples with UBSAN. 
+
 The main change is that the internals of the package have been rewritten to use
 Rcpp. This means that packages linking to lvec will have to be rewritten. At the
 moment this is only the package 'ldat' which is also maintained by me. I will