diff --git a/docs/common-patterns.md b/docs/common-patterns.md
index 7d7d87056..3402fb0d1 100644
--- a/docs/common-patterns.md
+++ b/docs/common-patterns.md
@@ -14,7 +14,7 @@ This example adds Elixir install scripts to `~/.mix/escripts`:
 }
 ```
 
-## How Can I use Rosetta packages?
+## How can I use Rosetta packages?
 
 It's possible to tell Nix to use Intel packages when using macOS ARM:
 
@@ -33,3 +33,15 @@ in {
   ];
 }
 ```
+
+## How to exclude packages from the container?
+
+```nix
+{ pkgs, ... }: {
+  packages = [
+    pkgs.git
+  ] ++ lib.optionals !config.container.isBuilding [
+    pkgs.haskell-language-server
+  ];
+}
+```