diff --git a/common/default.nix b/common/default.nix
index 838bb20..b5a1f7f 100644
--- a/common/default.nix
+++ b/common/default.nix
@@ -49,5 +49,6 @@
     ll = "exa -l";
     la = "exa -la";
     tree = "exa -T";
+    apt = "echo 'please use nix-env -iA <packagename> instead to install packages.'";
   };
 }