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-rw-r--r--nixos/doc/manual/configuration/declarative-packages.section.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/nixos/doc/manual/configuration/declarative-packages.section.md b/nixos/doc/manual/configuration/declarative-packages.section.md
index 480e250da8c7..6cdd520dcf15 100644
--- a/nixos/doc/manual/configuration/declarative-packages.section.md
+++ b/nixos/doc/manual/configuration/declarative-packages.section.md
@@ -7,7 +7,9 @@ following line to `configuration.nix` enables the Mozilla Thunderbird
 email application:
 
 ```nix
-environment.systemPackages = [ pkgs.thunderbird ];
+{
+  environment.systemPackages = [ pkgs.thunderbird ];
+}
 ```
 
 The effect of this specification is that the Thunderbird package from