diff --git a/adapters/README.md b/adapters/README.md
index 9c89e13..38504bf 100644
--- a/adapters/README.md
+++ b/adapters/README.md
@@ -7,7 +7,7 @@ To use, supply an instance of your desired converter when building your `Moshi`
 
 ```java
 Moshi moshi = new Moshi.Builder()
-    .addConverterFactory(new Rfc3339DateJsonAdapter())
+    .addConverterFactory(Date.class, new Rfc3339DateJsonAdapter())
     //etc
     .build();
 ```