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diff --git a/day2/ex1-hello-world/solution.nix b/day2/ex1-hello-world/solution.nix
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+/*
+   This first exercise demonstrates how to define a processing stage,
+which is just instructions on how to compute an output (the
+`buildCommand`) from some inputs (in this case, there are no inputs).
+Each stage must minimally define a `name`, shell code to build the
+output in `buildCommand`, and any software that's required in
+`buildInputs`.  Note that `buildInputs = []` if not defined, meaning no
+extra requirements over the standard environment.
+
+Try replacing the echo below with output from the GNU hello program.
+Hint:  the GNU hello program is available at `pkgs.hello` and the
+executable is called `hello`.
+*/
+{bionix}:
+with bionix;
+  stage {
+    name = "hello-world";
+
+    buildInputs = [pkgs.hello];
+
+    buildCommand = ''
+      hello > $out
+    '';
+  }