diff --git a/_style/declarations.md b/_style/declarations.md
index 6679fecada..dea8ee8f47 100644
--- a/_style/declarations.md
+++ b/_style/declarations.md
@@ -123,7 +123,7 @@ applicable):
 
     @Transaction
     @throws(classOf[IOException])
-    override protected final def foo() {
+    override protected final def foo(): Unit = {
       ...
     }