diff --git a/public/service-hydra-core.nix b/public/service-hydra-core.nix
index 8437aa3..fafaa7a 100644
--- a/public/service-hydra-core.nix
+++ b/public/service-hydra-core.nix
@@ -16,6 +16,9 @@ let
     rev = "de55303197d997c4fc5503b52b1321ae9528583d";
     sha256 = "0nimqsbpjxfwha6d5gp6a7jh50i83z1llmx30da4bscsic8z1xly";
   };
+
+  # information pour l'état de hydra :
+  # hydra-queue-runner --status | json_pp
 in
 mkIf cfg.hydra-core {