diff --git a/modules/services/misc/nixos-manual.nix b/modules/services/misc/nixos-manual.nix
index 8447bc8ae75..5fa65990e2d 100644
--- a/modules/services/misc/nixos-manual.nix
+++ b/modules/services/misc/nixos-manual.nix
@@ -56,7 +56,7 @@ in
type = types.uniq types.string;
description = ''
Revision of the targeted source file. This value can either be
- "local", "HEAD" or any
+ "local", "HEAD" or any
revision number embedded in a string.
'';
};