diff --git a/client/src/main/kotlin/com/r3corda/client/testing/Expect.kt b/client/src/main/kotlin/com/r3corda/client/testing/Expect.kt
index cc3cdba34d..9281af5b85 100644
--- a/client/src/main/kotlin/com/r3corda/client/testing/Expect.kt
+++ b/client/src/main/kotlin/com/r3corda/client/testing/Expect.kt
@@ -17,7 +17,7 @@ import rx.Observable
  *
  * Example usage:
  *
- * val stream: EventStream<SomeEvent> = (..)
+ * val stream: Ovservable<SomeEvent> = (..)
  * stream.expectEvents(
  *   sequence(
  *     expect { event: SomeEvent.A -> require(event.isOk()) },