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diff --git a/3 resources/nix/language/keyword-rec.md b/3 resources/nix/language/keyword-rec.md
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+Recursive attribute sets can reference values declared earlier in the same set. 
+keyword: `rec`
+```nix
+rec {
+  one = 1;
+  two = one + 1;
+}
+```
+
+Ordering does not matter:
+```nix
+nix-repl> rec { two = one + 1; one = 1; }
+{
+  one = 1;
+  two = 2;
+}
+```