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+This chapter shows you how to write Nix expressions, which instruct Nix
+how to build packages. It starts with a simple example (a Nix expression
+for GNU Hello), and then moves on to a more in-depth look at the Nix
+expression language.
+
+> **Note**
+>
+> This chapter is mostly about the Nix expression language. For more
+> extensive information on adding packages to the Nix Packages
+> collection (such as functions in the standard environment and coding
+> conventions), please consult [its
+> manual](http://nixos.org/nixpkgs/manual/).