diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02b5fc0..ac48936 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+v3
+==
+
+mainly a manufacturing update.
+all parts are on one side.
+
+the schematic remains fully compatible with v2.
+
+changes:
+
+- remove fuse as the designed has been proved, and the glues should prevent shorts
+- put buttons on back side
+- use button mounting holes as test points
+
 v2
 ==