diff --git a/modules/clightning.nix b/modules/clightning.nix
index 1e654ee..50dc7c0 100644
--- a/modules/clightning.nix
+++ b/modules/clightning.nix
@@ -15,6 +15,7 @@ let
     ${optionalString (cfg.bitcoin-rpcconnect != null) "bitcoin-rpcconnect=${cfg.bitcoin-rpcconnect}"}
     bitcoin-rpcuser=${config.services.bitcoind.rpc.users.public.name}
     rpc-file-mode=0660
+    ${cfg.extraConfig}
   '';
 in {
   options.services.clightning = {
@@ -70,6 +71,11 @@ in {
       default = "/var/lib/clightning";
       description = "The data directory for clightning.";
     };
+    extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      description = "Additional lines appended to the config file.";
+    };
     user = mkOption {
       type = types.str;
       default = "clightning";