diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..c9f6a2f
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,9 @@
+v0
+==
+
+first prototype build.
+
+it works, but almost only on specification compliant cables:
+
+- some cables don't have all 4 GND and VBUS pins in the C plug
+- normally the shield should connect both shells AND be tied to ground on BOTH ends, but I've seen ALL possible combinations thereof