diff --git a/docs/superpowers/specs/2026-03-18-adguard-home-design.md b/docs/superpowers/specs/2026-03-18-adguard-home-design.md
index 945f806..8ff42bd 100644
--- a/docs/superpowers/specs/2026-03-18-adguard-home-design.md
+++ b/docs/superpowers/specs/2026-03-18-adguard-home-design.md
@@ -42,7 +42,7 @@ myModules.adguard = {
   };
 
   bootstrapDns = lib.mkOption {
-    type = lib.types.listOf lib.types.str;
+    type = lib.types.listOf (lib.types.str);
     default = [ "194.242.2.2" "2a07:e340::2" ];
     description = "Bootstrap DNS servers for resolving DoH upstream";
   };