diff --git a/nixos/lib/eval-config.nix b/nixos/lib/eval-config.nix
index a87b285c5b7..2e7971cca81 100644
--- a/nixos/lib/eval-config.nix
+++ b/nixos/lib/eval-config.nix
@@ -1,4 +1,4 @@
-# From an end-user configuration file (`configuration'), build a NixOS
+# From an end-user configuration file (`configuration.nix'), build a NixOS
 # configuration object (`config') from which we can retrieve option
 # values.