diff --git a/docs/general/attributes.md b/docs/general/attributes.md
index e9f9dddad7..c0e980f477 100644
--- a/docs/general/attributes.md
+++ b/docs/general/attributes.md
@@ -306,11 +306,12 @@ Examples of `peer.service` that users may specify:
 
 ## General identity attributes
 
-These attributes may be used for any operation with an authenticated and/or authorized enduser.
+These attributes may be used for any operation with an authenticated or anonymous enduser.
 
 <!-- semconv identity -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
+| `enduser.anon_id` | string | Randomly generated id of an anonymous user that is persisted throughout the lifetime of the visits. | `V1StGXR8_Z5jdHi6B-myT` | Recommended |
 | `enduser.id` | string | Username or client_id extracted from the access token or [Authorization](https://tools.ietf.org/html/rfc7235#section-4.2) header in the inbound request from outside the system. | `username` | Recommended |
 | `enduser.role` | string | Actual/assumed role the client is making the request under extracted from token or application security context. | `admin` | Recommended |
 | `enduser.scope` | string | Scopes or granted authorities the client currently possesses extracted from token or application security context. The value would come from the scope associated with an [OAuth 2.0 Access Token](https://tools.ietf.org/html/rfc6749#section-3.3) or an attribute value in a [SAML 2.0 Assertion](http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html). | `read:message, write:files` | Recommended |
diff --git a/model/general.yaml b/model/general.yaml
index e3bad3d46a..5c47e0c66e 100644
--- a/model/general.yaml
+++ b/model/general.yaml
@@ -43,7 +43,7 @@ groups:
     prefix: enduser
     type: span
     brief: >
-      These attributes may be used for any operation with an authenticated and/or authorized enduser.
+      These attributes may be used for any operation with an authenticated or anonymous enduser.
     attributes:
       - id: id
         type: string
@@ -52,6 +52,11 @@ groups:
           [Authorization](https://tools.ietf.org/html/rfc7235#section-4.2)
           header in the inbound request from outside the system.
         examples: 'username'
+      - id: anon_id
+        type: string
+        brief: >
+          Randomly generated id of an anonymous user that is persisted throughout the lifetime of the visits.
+        examples: 'V1StGXR8_Z5jdHi6B-myT'
       - id: role
         type: string
         brief: 'Actual/assumed role the client is making the request under extracted from token or application security context.'