diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29..b3b25fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1,6 @@
+v0
+==
+
+this is a large development board.
+it accepts the classical STM32F103 (which I'm more familiar with), and CH32V203 (cheaper).
+it has a proper debug port and buttons.
diff --git a/README.md b/README.md
index 7c35594..c944e0a 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,20 @@
-these are the hardware design files for **insert project name here**.
+passkey type your credentials for you.
 
 purpose
 =======
 
+This USB dongle will help you out if you have to enter your credentials frequently.
+Temporarily store the credential on it, and press a button for passkey to enter it for you.
+
 usage
 =====
+
+- passkey will appear as USB serial port and keyboard
+- connect to it using a serial terminal (baud rate it not important)
+- enter the credentials you often have to input
+- press on the U button for passkey to input the username and password
+- press on the P button for passkey to input password
+
+The credentials are save in RAM and will clear as soon a power is removed.
+You can also clear the credentials by pressing on both buttons.
+The passkey will blink until credentials are saved.