diff --git a/apisix/init.lua b/apisix/init.lua
index 4393488588a7..b591e363d3e1 100644
--- a/apisix/init.lua
+++ b/apisix/init.lua
@@ -452,6 +452,8 @@ function _M.http_access_phase()
             end
 
             if upstream.value.enable_websocket then
+                core.log.warn("DEPRECATE: enable websocket in upstream will be removed soon. ",
+                              "Please enable it in route/service level.")
                 enable_websocket = true
             end