diff --git a/sek.opam b/sek.opam
index 60591f39f60f2ae45429e6b91b8d83177bdacc7b..c3d4a3c16cc744e49914c0ab2670cd0b8f71652f 100644
--- a/sek.opam
+++ b/sek.opam
@@ -9,6 +9,7 @@ authors: [
 homepage: "https://gitlab.inria.fr/fpottier/sek"
 dev-repo: "git+https://gitlab.inria.fr/fpottier/sek.git"
 bug-reports: "francois.pottier@inria.fr"
+license: "LGPL-3.0-or-later"
 build: [
   ["dune" "build" "-p" name "-j" jobs]
 ]