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-rw-r--r--doc/manual/src/advanced-topics/post-build-hook.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/manual/src/advanced-topics/post-build-hook.md b/doc/manual/src/advanced-topics/post-build-hook.md
index 1479cc3a4..a251dec48 100644
--- a/doc/manual/src/advanced-topics/post-build-hook.md
+++ b/doc/manual/src/advanced-topics/post-build-hook.md
@@ -90,7 +90,7 @@ Then, restart the `nix-daemon`.
Build any derivation, for example:
```console
-$ nix-build -E '(import <nixpkgs> {}).writeText "example" (builtins.toString builtins.currentTime)'
+$ nix-build --expr '(import <nixpkgs> {}).writeText "example" (builtins.toString builtins.currentTime)'
this derivation will be built:
/nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv
building '/nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv'...