diff --git a/pkgs/by-name/kn/knot-resolver-manager_6/package.nix b/pkgs/by-name/kn/knot-resolver-manager_6/package.nix
index 890e71fdb362..1f4e03cc7e6d 100644
--- a/pkgs/by-name/kn/knot-resolver-manager_6/package.nix
+++ b/pkgs/by-name/kn/knot-resolver-manager_6/package.nix
@@ -41,9 +41,10 @@ python3Packages.buildPythonPackage {
     aiohttp
     jinja2
     pyyaml
-    prometheus-client
+    prometheus-client # optional, for prometheus metrics
     supervisor
     typing-extensions
+    watchdog # optional, watching changes in files (TLS certs, RPZs)
   ];
 
   # set up (additional) Lua dependencies