diff --git a/README.md b/README.md
index 811375a..7e2802c 100644
--- a/README.md
+++ b/README.md
@@ -126,10 +126,41 @@ Thus interface with is will be very easy and there is a lot of software support.
 The limitation is that it supports only one universe of 512 channels, or 170 RGB LEDs.
 A solution would be to control modes instead of individual LEDs.
 
+intended use case
+-----------------
+
+The purpose is to provide a simple board able to control LEDs strips.
+It should be better than general purpose development boards.
+A built-in voltage converter allows driving an LED strip.
+It is intended for small installations, not requiring more than 5 meters of LED strings.
+This keeps the power supply small.
+The board is not intended for large LED installation requiring a lot of power.
+
+The board should be cheap enough to be a default choice when creating a small LED installation.
+the goal is at 5 to 10€ per board.
+This prevents me for using Ethernet, since the PHY and magnetics are expensive (~ 3€).
+
+It should not require a complex installation.
+Something like a LAN requiring a permanent switch or router is already too much.
+The board should be able to work on its own.
+
+It should be make it easy to create multi-device installations.
+This is provided by the chaining capability.
+You can connect one device to another, and the job is done.
+This single link provides power.
+This allows using a single power supply for the whole installation, just connected to the first device in the chain.
+It should use cheap and common cable for the chain link, such as Ethernet cables.
+
+It should accept common off the shelves power supplies, such as 12-24V 2-4A bricks.
+
+The chain link should also allow synchronising the devices.
+Ideally it should also provide an interface to reliably remotely control them.
+Thus the DMX512 protocol.
+
 features
 --------
 
-Here a wish list of features I began with, in decreasing order:
+Here a wish list of features I began with, in decreasing order of importance:
 
 - daisy chain capability (providing data and power)
 - built-in power 5V power supply (input up to 30V)