diff --git a/README.md b/README.md
index b6dfa30..53a17d1 100644
--- a/README.md
+++ b/README.md
@@ -22,14 +22,14 @@ The designs are in the `cad` folder:
 Examples of SMA configurations are provide in `.json` files.
 See the documentation in `.scad` files to create or customize a SMA design.
 
+A tutorial on how to build a SMA using the SMALL library is available here:
+
+to do
+
+If you build a prototype by using the SMALL library, let me know  ;): sekisushai@gmail.com
+
 # SMA signal processing
 To encode the microphones signals onto Spherical Harmonics signals (i.e. Ambisonics signals), one can use ambitools.
 See www.sekisushai.net/ambitools/docs/mic_encoder.html for more infos.
 
 # SMA calibration with a robotic arm
-
-
-
-If you build a prototype by using the SMALL library, let me know ;)
-
-Pierre Lecomte