diff --git a/artifacts/notification-as-cloud-event.yaml b/artifacts/notification-as-cloud-event.yaml
index 5a44e4c8..b0e2c6ba 100644
--- a/artifacts/notification-as-cloud-event.yaml
+++ b/artifacts/notification-as-cloud-event.yaml
@@ -183,7 +183,8 @@ components:
         specversion:
           type: string
           description: Version of the specification to which this event conforms (must be 1.0 if it conforms to cloudevents 1.0.2 version)
-          minLength: 3
+          enum:
+            - "1.0"
         datacontenttype:
           type: string
           description: 'media-type that describes the event payload encoding, must be "application/json" for CAMARA APIs'
diff --git a/documentation/API-design-guidelines.md b/documentation/API-design-guidelines.md
index 44b279b6..419d7dc6 100644
--- a/documentation/API-design-guidelines.md
+++ b/documentation/API-design-guidelines.md
@@ -1483,7 +1483,7 @@ For consistency across CAMARA APIs, the uniform CloudEvents model must be used w
 | id | string | identifier of this event, that must be unique in the source context. | mandatory |
 | source | string - URI | identifies the context in which an event happened in the specific Provider Implementation. Often this will include information such as the type of the event source, the organization publishing the event or the process that produced the event. The exact syntax and semantics behind the data encoded in the URI is defined by the event producer. | mandatory |
 | type | string | a value describing the type of event related to the originating occurrence. For consistency across API we mandate following pattern: `org.camaraproject.<api-name>.<api-version>.<event-name>` with the `api-version` with letter 'v' and the major version like example org.camaraproject.device-status.v1.roaming-status | mandatory |
-| specversion | string | version of the specification to which this event conforms - must be "1.0" | mandatory |
+| specversion | string | version of the specification to which this event conforms - must be "1.0". As design guideline, this field will be modeled as an enum. | mandatory |
 | datacontenttype | string | media-type that describes the event payload encoding, must be `application/json` for CAMARA APIs| optional |
 | subject | string | describes the subject of the event - Not used in CAMARA notification. | optional |
 | time | string  date-time| Timestamp of when the occurrence happened. If the time of the occurrence cannot be determined then this attribute MAY be set to some other time (such as the current time) by the CloudEvents producer, however all producers for the same `source` MUST be consistent in this respect. In other words, either they all use the actual time of the occurrence or they all use the same algorithm to determine the value used. (must adhere to CAMARA date-time recommendation based on RFC 3339) | mandatory (*) |