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-rw-r--r--docs/reference-v3/func-req.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/reference-v3/func-req.md b/docs/reference-v3/func-req.md
index a70fb750..c84077d1 100644
--- a/docs/reference-v3/func-req.md
+++ b/docs/reference-v3/func-req.md
@@ -531,6 +531,8 @@ 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
*
@@ -549,6 +551,8 @@ 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
*