diff --git a/spec/Candid.md b/spec/Candid.md
index d1c37aa5..f68de3f3 100644
--- a/spec/Candid.md
+++ b/spec/Candid.md
@@ -452,7 +452,7 @@ A *service reference* points to a service and is described by an actor type. Thr
 ```
 type broker = service {
   findCounterService : (name : text) ->
-    (service {up : () -> (); current : () -> nat});
+    (service {up : () -> (); current : () -> (nat)});
 }
 ```