diff --git a/WHATS_NEW.md b/WHATS_NEW.md
index 653a25d5..4fc855ef 100644
--- a/WHATS_NEW.md
+++ b/WHATS_NEW.md
@@ -6,6 +6,7 @@ WHATS NEW
 - change license from GPLv3 to Apache v2 to make it even more attractive to other developers
 - pushed binaries to maven central, i.e. made it better accessible and we get rid of our own repo
 - outsourced various io operations, e.g. reading writing problem/algorithm to a new module called jsprit-io. this way the core is even more lightweight and less dependent on other libraries
+- switched from log4j to the [logger facade slf4j](http://www.slf4j.org/) to allow developers to plugin the logger of their choice
 - made it much more memory efficient for large problems
 - add priority feature