diff --git a/nixos/cli.nix b/nixos/cli.nix
index d71cc19f..58d03732 100644
--- a/nixos/cli.nix
+++ b/nixos/cli.nix
@@ -14,5 +14,6 @@
     calcurse file python37Packages.binwalk-full
     nixops imagemagick
     docker-compose rustup
+    knockknock
   ];
 }