diff --git a/README.md b/README.md
index 2380159293fdde2f039685ff42c2d008e043777e..80923489d1c6ad24c978f46c87b47c761e01b509 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,14 @@
 
 
 In order to create a bundle of everything needed to run COLIBRI.
-run `./bundle.sh` it will create a relocalisable directory `bundle`.
\ No newline at end of file
+run `./bundle.sh` it will create a relocalisable directory `bundle`.
+
+
+# Compilation on linux #
+ The up-to-date information could be found in `.gitlab-ci.yml`.
+
+# Compilation on windows #
+ The compilation is helped by using
+ https://fdopen.github.io/opam-repository-mingw/ , it will install ocaml
+ compiler but also mingw for the C part. Use ocaml-env to setup the environement
+ for the compilation. Then the compilation is the same than for linux.