diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index c795e2d1a..5cb50f823 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -6359,6 +6359,8 @@ router-enable_snat:
     when the traffic is sent to/received from the external network.
     ``false`` means no NAT is applied for traffic from/to the external network.
     It is available when ``ext-gw-mode`` extension is enabled.
+    ``Note`` that depending on the backend and its configuration, the
+    SNAT behavior for nested routers may differ.
   in: body
   required: true
   type: boolean