Merge pull request oauth-wg#140 from oauth-wg/PieterKas-patch-1

Clarification on token context

draft-ietf-oauth-transaction-tokens.md

@@ -154,7 +154,7 @@ Txn-Tokens are short-lived, signed JWTs {{RFC7519}} that assert the identity of
 ## Creating Txn-Tokens
 
 ### Initial Creation
-Txn-Tokens are typically created when a workload is invoked using an endpoint that is externally visible, and is authorized using a separate mechanism, such as an OAuth {{RFC6749}} access token or an OpenID Connect {{OpenIdConnect}} ID token. This workload then performs an OAuth 2.0 Token Exchange {{RFC8693}} to obtain a Txn-Token. To do this, it invokes a special Token Service (the Txn-Token Service) and provides context that is sufficient for it to generate a Txn-Token. This context MAY include:
+Txn-Tokens are typically created when a workload is invoked using an endpoint that is externally visible, and is authorized using a separate mechanism, such as an OAuth {{RFC6749}} access token or an OpenID Connect {{OpenIdConnect}} ID token. This workload then performs an OAuth 2.0 Token Exchange {{RFC8693}} to obtain a Txn-Token. To do this, it invokes a special Token Service (the Txn-Token Service) and provides context that is sufficient for it to generate a Txn-Token. The context information provided to the Txn-Token Service MAY include:
 
 * The external authorization token (e.g., the OAuth access token)
 * Parameters that are required to be bound for the duration of this call