diff --git a/nombres.opam b/nombres.opam
new file mode 100644
index 0000000..46de998
--- /dev/null
+++ b/nombres.opam
@@ -0,0 +1,28 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+description: """
+Convert ints into french.
+
+Some references:
+- https://leconjugueur.lefigaro.fr/frlesnombres.php
+- https://www.miakinen.net/vrac/nombres
+- https://www.dcode.fr/ecriture-nombre-lettres
+"""
+depends: [
+  "dune" {>= "2.8"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]