diff --git a/common/default.nix b/common/default.nix
index 3d3cd5d..1d9eede 100644
--- a/common/default.nix
+++ b/common/default.nix
@@ -49,6 +49,7 @@
     ll = "exa -l";
     la = "exa -la";
     tree = "exa -T";
+    apt = "echo 'please use nix-env -iA <packagename> instead to install packages.'";
   };
 
   users.mutableUsers = false;