diff --git a/src/nix/flake.md b/src/nix/flake.md
index a9b7037625b..b380e68ac3e 100644
--- a/src/nix/flake.md
+++ b/src/nix/flake.md
@@ -648,7 +648,7 @@ following fields:
 * `inputs`: The dependencies of this node, as a mapping from input
   names (e.g. `nixpkgs`) to node labels (e.g. `n2`).
 
-* `original`: The original input specification from `flake.lock`, as a
+* `original`: The original input specification from `flake.nix`, as a
   set of `builtins.fetchTree` arguments.
 
 * `locked`: The locked input specification, as a set of