diff --git a/serialization.md b/serialization.md
index 65f4985be..4ede2297a 100644
--- a/serialization.md
+++ b/serialization.md
@@ -53,7 +53,7 @@ Example:
   "cloudEventsVersion": "0.1",
   "eventID": "6480da1a-5028-4301-acc3-fbae628207b3",
   "source": "http://example.com/repomanager",
-  "eventType": "created",
+  "eventType": "com.example.repro.create",
   "eventTypeVersion": "v1.5",
   "eventTime": "2018-04-01T23:12:34Z",
   "schemaURL": "https://product.example.com/schema/repo-create",
diff --git a/spec.md b/spec.md
index 989fd95be..0f045d307 100644
--- a/spec.md
+++ b/spec.md
@@ -264,14 +264,15 @@ that contains both context and data).
 
 ### eventType
 * Type: String
-* Description: Type of the event `data`. Producers can specify the format of
-  this, depending on their service. This enables the interpretation of `data`,
-  and can be used for routing, policy and more.
+* Description: Type of occurrence which has happened. Often this
+  property is used for routing, observability, policy enforcement, etc.
 * Constraints:
-  * REQUIRED
-  * MUST be a non-empty string
-* Examples:
-  * customer.created
+   * REQUIRED
+   * MUST be a non-empty string
+   * SHOULD be prefixed with a reverse-DNS name. The prefixed domain dictates
+            the organization which defines the semantics of this event type.
+* Examples
+   * com.github.pull.create
 
 ### eventTypeVersion
 * Type: String