diff --git a/docs/openrpc.json b/docs/openrpc.json
index 2baaa26c93..190133ff98 100644
--- a/docs/openrpc.json
+++ b/docs/openrpc.json
@@ -944,7 +944,7 @@
         "name": "The current client version.",
         "schema": {
           "type": "string",
-          "pattern": "relay/[0-9]\\.[0-9]\\.[0-9]"
+          "pattern": "relay/[0-9]\\.[0-9]\\.[0-9](-[a-zA-Z0-9]+)"
         }
       }
     },