diff --git a/src/core/CCOpt.mli b/src/core/CCOpt.mli
index 04133e09..60d39aab 100644
--- a/src/core/CCOpt.mli
+++ b/src/core/CCOpt.mli
@@ -1,3 +1,5 @@
+(** Option module
+    @deprecated use `CCOption` instead. *)
 [@@@ocaml.deprecated "use CCOption instead"]
 
 include module type of CCOption