diff --git a/src/core/CCArray.mli b/src/core/CCArray.mli
index f254a8e6..29e1cbfa 100644
--- a/src/core/CCArray.mli
+++ b/src/core/CCArray.mli
@@ -133,7 +133,9 @@ val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
     @since 1.0 *)
 
 val mem : ?eq:('a -> 'a -> bool) -> 'a -> 'a t -> bool
-(** [mem ~eq x a] return true if x is present in [a]. Linear time. *)
+(** [mem ~eq x a] return true if x is present in [a]. Linear time.
+    @since NEXT_RELEASE
+*)
 
 val find_map : ('a -> 'b option) -> 'a t -> 'b option
 (** [find_map f a] returns [Some y] if there is an element [x] such
diff --git a/src/core/CCArrayLabels.mli b/src/core/CCArrayLabels.mli
index bd23893b..c74b7a11 100644
--- a/src/core/CCArrayLabels.mli
+++ b/src/core/CCArrayLabels.mli
@@ -132,7 +132,9 @@ val sort_ranking : f:('a -> 'a -> int) -> 'a t -> int array
     @since 1.0 *)
 
 val mem : ?eq:('a -> 'a -> bool) -> 'a -> 'a t -> bool
-(** [mem ~eq x a] return true if x is present in [a]. Linear time. *)
+(** [mem ~eq x a] return true if x is present in [a]. Linear time.
+    @since NEXT_RELEASE
+*)
 
 val find_map : f:('a -> 'b option) -> 'a t -> 'b option
 (** [find_map ~f a] returns [Some y] if there is an element [x] such