Nit in readme

README.md

diff --git a/README.md b/README.md
index 1186465..13ab252 100644
--- a/README.md
+++ b/README.md
@@ -181,7 +181,7 @@
 The following code creates a _topic_ and sends a simple test message:
 
 ```dart
-var topic = await pubsub.createTopic('my'topic');
+var topic = await pubsub.createTopic('my-topic');
 await topic.publishString('Hello, world!')
 ```
 
@@ -231,4 +231,4 @@
 [googleapis]: https://pub.dartlang.org/packages/googleapis
 [googleapisbeta]: https://pub.dartlang.org/packages/googleapis_beta
 [googleapisauth]: https://pub.dartlang.org/packages/googleapis_beta
-[appengine]: https://pub.dartlang.org/packages/appengine
\ No newline at end of file
+[appengine]: https://pub.dartlang.org/packages/appengine