diff --git a/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.mli b/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.mli
index 92f588c3..ba45e3cc 100644
--- a/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.mli
+++ b/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.mli
@@ -18,8 +18,8 @@ val create_backend :
   unit ->
   (module Opentelemetry.Collector.BACKEND)
 (** Create a new backend using lwt and cohttp
-    @param after_cleanup
-      if provided, this is resolved into [()] after cleanup is done (since 0.11)
+
+  NOTE [after_cleanup] optional parameter removed since NEXT_RELEASE
 *)
 
 val setup :