diff --git a/README.md b/README.md
index d2f17b5d..cc98aea9 100644
--- a/README.md
+++ b/README.md
@@ -172,7 +172,7 @@ export NIX_PATH=darwin=$HOME/.nix-defexpr/darwin:darwin-config=$HOME/.nixpkgs/da
 cp ~/.nix-defexpr/darwin/modules/examples/simple.nix ~/.nixpkgs/darwin-configuration.nix
 
 # you can also use this to rebootstrap nix-darwin in case
-# darwin-rebuild is to old to activate the system.
+# darwin-rebuild is too old to activate the system.
 $(nix-build '<darwin>' -A system --no-out-link)/sw/bin/darwin-rebuild build
 $(nix-build '<darwin>' -A system --no-out-link)/sw/bin/darwin-rebuild switch