afb-xreq: Forbids (un)subscribes after reply

[src/app-framework-binder.git] / docs / reference-v3 / func-req.md

diff --git a/docs/reference-v3/func-req.md b/docs/reference-v3/func-req.md
index 2564405..fb61575 100644 (file)
--- a/docs/reference-v3/func-req.md
+++ b/docs/reference-v3/func-req.md
@@ -528,6 +528,8 @@ int afb_req_subcall_sync(
  * Establishes for the client link identified by 'req' a subscription
  * to the 'event'.
  *
+ * Establishing subscription MUST be called BEFORE replying to the request.
+ *
  * @param req the request
  * @param event the event to subscribe
  *
@@ -546,6 +548,8 @@ int afb_req_subscribe(
  * link identified by 'req'.
  * Returns 0 in case of successful subscription or -1 in case of error.
  *
+ * Revoking subscription MUST be called BEFORE replying to the request.
+ *
  * @param req the request
  * @param event the event to revoke
  *