diff --git a/public/service-hydra-core.nix b/public/service-hydra-core.nix
index d51b10c..c34249a 100644
--- a/public/service-hydra-core.nix
+++ b/public/service-hydra-core.nix
@@ -46,6 +46,7 @@ mkIf cfg.hydra-core {
 
   # une fois installé :
   # 1. créer chef SSH : ssh-keygen -C "hydra@pedro.dubronetwork.fr" -N "" -f /etc/nixos/id_buildfarm
+  # ssh-keygen -t ed25519 -C "hydra MACHINE" -f /etc/nixos/hydra-ssh-key
   # accessible à hydra.pedro.dubnronetwork.fr
   
   nix = {