1 files changed, 4 insertions, 0 deletions
diff --git a/doc/sphinx/rest.rst b/doc/sphinx/rest.rst
index a9f78a9..79c1355 100644
--- a/doc/sphinx/rest.rst
+++ b/doc/sphinx/rest.rst
@@ -35,6 +35,7 @@ Receiving Configuration
 .. http:get:: /config
 
   Obtain the configuration details of the escrow provider.
+  This specification corresponds to ``current`` protocol being version **0**.
 
   **Response:**
 
@@ -54,6 +55,9 @@ Receiving Configuration
       // The format is "current:revision:age".
       version: string;
 
+      // URN of the implementation (needed to interpret 'revision' in version).
+      // @since v0, may become mandatory in the future.
+      implementation?: string;
       // Currency in which this provider processes payments.
       currency: string;