diff --git a/README.md b/README.md
index 4c20eb4..f825fb8 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,18 @@ design choice
 changelog
 =========
 
+v1
+--
+
+v0 needed dual side hand assembly, though hole soldering, and lead cutting.
+v1 is an assembly friendly redesign.
+it now uses only parts which can be SMD soldered.
+all parts are on the top side of the board.
+because the coin cell holder is also on top, I used a CR1220 holder instead of a CR2032 holder, so the board remains small.
+for quick and infrequent cable tests, a 35 mAh CR1220 is sufficient.
+since the battery can be side loaded, instead of top loaded, the holder is even smaller.
+I also used different color LEDs for each test.
+
 v0
 --