grammar fix

src/kuzzle-events/index.md

@@ -12,4 +12,4 @@ Welcome to the kuzzle events documentation!
 
 Every time Kuzzle receives a request coming from a client, it routes it towards a Controller and an Action, which processes it and sends the result back to the client. Each step of this life-cycle triggers an event. Here are the different types of events that Plugins can listen to.
 
-There is two kind of events, `pipes` and `hooks`. Report to the [Plugin Reference documentation]({{ site_base_path }}plugins-reference/plugins-features/adding-pipes/#) for more details on how to listen to them.
+There are two kind of events, `pipes` and `hooks`. Report to the [Plugin Reference documentation]({{ site_base_path }}plugins-reference/plugins-features/adding-pipes/#) for more details on how to listen to them.