diff --git a/doc/VERSIONS.txt b/doc/VERSIONS.txt
index b23656deb080f831ce8ae2f5470cd9a630a4212e..300122e2c28ac733ab786a460fb8df102d62fcee 100644
--- a/doc/VERSIONS.txt
+++ b/doc/VERSIONS.txt
@@ -1,6 +1,7 @@
 2.xx: new interface to CAD entity creation, constructive solid geometry features
 and boolean operations using SetFactory("OpenCASCADE"); replaced "Ruled Surface"
-with "Surface"; new "Unique" operator.
+with "Surface"; new "Unique" operator; faster 3D tetrahedral mesh optimization
+enabled by default.
 
 2.16.0 (January 3, 2017): small improvements (list functions, second order hexes
 for MED, GUI) and bug fixes.