diff --git a/README.md b/README.md
index 855bfe0..b49414a 100644
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ sudo nixos-generate-config --dir hosts/$(hostname)
 
 ```shell
 # Note how your shell prefix changes.
-nix-shell --packages appimage-run
+nix-shell -p appimage-run
 ```
 ```shell
 # Inside the shell, you can run an AppImage:
@@ -297,7 +297,7 @@ nix-info -m
 
 ```shell
 # Note how your shell prefix changes.
-nix-shell --packages nix-index
+nix-shell -p nix-index
 ```
 ```shell
 # Either build the index manually (requires >12GB RAM):