diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index ff5ac1db..9c2c8706 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -1,5 +1,9 @@
 = Changelog
 
+== 2.4.1
+
+- revert some compatibility-breaking changes in label modules
+
 == 2.4
 
 === breaking:
diff --git a/containers.opam b/containers.opam
index 590e4d9d..e4a478e4 100644
--- a/containers.opam
+++ b/containers.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "containers"
-version: "2.4"
+version: "2.4.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 synopsis: "A modular, clean and powerful extension of the OCaml standard library"
diff --git a/src/core/CCArray.mli b/src/core/CCArray.mli
index 0b138167..b5ddb05d 100644
--- a/src/core/CCArray.mli
+++ b/src/core/CCArray.mli
@@ -110,12 +110,10 @@ val reverse_in_place : 'a t -> unit
 (** [reverse_in_place a] reverses the array [a] in place. *)
 
 val sorted : ('a -> 'a -> int) -> 'a t -> 'a array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sorted f a] makes a copy of [a] and sorts it with [f].
     @since 1.0 *)
 
 val sort_indices : ('a -> 'a -> int) -> 'a t -> int array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sort_indices f a] returns a new array [b], with the same length as [a],
     such that [b.(i)] is the index at which the [i]-th element of [sorted f a]
     appears in [a]. [a] is not modified.
@@ -125,7 +123,6 @@ val sort_indices : ('a -> 'a -> int) -> 'a t -> int array
     @since 1.0 *)
 
 val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sort_ranking f a] returns a new array [b], with the same length as [a],
     such that [b.(i)] is the index at which the [i]-th element of [a] appears
     in [sorted f a]. [a] is not modified.
diff --git a/src/core/CCArrayLabels.mli b/src/core/CCArrayLabels.mli
index c53ae79b..a8e6624f 100644
--- a/src/core/CCArrayLabels.mli
+++ b/src/core/CCArrayLabels.mli
@@ -108,12 +108,10 @@ val reverse_in_place : 'a t -> unit
 (** [reverse_in_place a] reverses the array [a] in place. *)
 
 val sorted : f:('a -> 'a -> int) -> 'a t -> 'a array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sorted ~f a] makes a copy of [a] and sorts it with [~f].
     @since 1.0 *)
 
 val sort_indices : f:('a -> 'a -> int) -> 'a t -> int array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sort_indices ~f a] returns a new array [b], with the same length as [a],
     such that [b.(i)] is the index at which the [i]-th element of [sorted ~f a]
     appears in [a]. [a] is not modified.
@@ -123,7 +121,6 @@ val sort_indices : f:('a -> 'a -> int) -> 'a t -> int array
     @since 1.0 *)
 
 val sort_ranking : f:('a -> 'a -> int) -> 'a t -> int array
-    (* FIXME: better label this ~cmp ?? *)
 (** [sort_ranking ~f a] returns a new array [b], with the same length as [a],
     such that [b.(i)] is the index at which the [i]-th element of [a] appears
     in [sorted ~f a]. [a] is not modified.
diff --git a/src/core/CCList.mli b/src/core/CCList.mli
index f2ab25cd..9d331dbe 100644
--- a/src/core/CCList.mli
+++ b/src/core/CCList.mli
@@ -377,9 +377,9 @@ val find_idx : ('a -> bool) -> 'a t -> (int * 'a) option
 (** [find_idx p x] returns [Some (i,x)] where [x] is the [i]-th element of [l],
     and [p x] holds. Otherwise returns [None]. *)
 
-val remove : eq:('a -> 'a -> bool) -> 'a -> 'a t -> 'a t
+val remove : eq:('a -> 'a -> bool) -> key:'a -> 'a t -> 'a t
     (* FIXME: the original CCList.mli uses ~x instead of ~key !! *)
-(** [remove key l] removes every instance of [key] from [l]. Tail-recursive.
+(** [remove ~key l] removes every instance of [key] from [l]. Tail-recursive.
     @param eq equality function.
     @since 0.11 *)
 
@@ -589,9 +589,8 @@ module Assoc : sig
       @since 0.16 *)
 
   val update :
-    eq:('a->'a->bool) -> ('b option -> 'b option) -> 'a -> ('a,'b) t -> ('a,'b) t
-      (* FIXME: the original no labels mli kept the ~f label ! *)
-  (** [update k f l] updates [l] on the key [k], by calling [f (get l k)]
+    eq:('a->'a->bool) -> f:('b option -> 'b option) -> 'a -> ('a,'b) t -> ('a,'b) t
+  (** [update k ~f l] updates [l] on the key [k], by calling [f (get l k)]
       and removing [k] if it returns [None], mapping [k] to [v'] if it
       returns [Some v'].
       @since 0.16 *)
diff --git a/src/core/CCListLabels.mli b/src/core/CCListLabels.mli
index ce373ff3..fbfe7bd7 100644
--- a/src/core/CCListLabels.mli
+++ b/src/core/CCListLabels.mli
@@ -375,7 +375,7 @@ val find_idx : f:('a -> bool) -> 'a t -> (int * 'a) option
 (** [find_idx p x] returns [Some (i,x)] where [x] is the [i]-th element of [l],
     and [p x] holds. Otherwise returns [None]. *)
 
-val remove : eq:(('a -> 'a -> bool) [@keep_label]) -> key:'a -> 'a t -> 'a t
+val remove : eq:(('a -> 'a -> bool) [@keep_label]) -> key:('a [@keep_label]) -> 'a t -> 'a t
     (* FIXME: the original CCList.mli uses ~x instead of ~key !! *)
 (** [remove ~key l] removes every instance of [key] from [l]. Tail-recursive.
     @param eq equality function.
@@ -587,8 +587,7 @@ module Assoc : sig
       @since 0.16 *)
 
   val update :
-    eq:(('a->'a->bool) [@keep_label]) -> f:('b option -> 'b option) -> 'a -> ('a,'b) t -> ('a,'b) t
-      (* FIXME: the original no labels mli kept the ~f label ! *)
+    eq:(('a->'a->bool) [@keep_label]) -> f:(('b option -> 'b option) [@keep_label]) -> 'a -> ('a,'b) t -> ('a,'b) t
   (** [update k ~f l] updates [l] on the key [k], by calling [f (get l k)]
       and removing [k] if it returns [None], mapping [k] to [v'] if it
       returns [Some v'].
diff --git a/src/unlabel.ml b/src/unlabel.ml
index 443786d2..ad1076ef 100644
--- a/src/unlabel.ml
+++ b/src/unlabel.ml
@@ -28,7 +28,7 @@ let search_all pat s =
   List.rev (search_rest [] 0)
 ;;
 
-(* replase first occurence of pat with subst in s *)
+(* replace first occurrence of pat with subst in s *)
 let replace_first pat subst s =
   let pos = search pat s 0 in
   let patl = String.length pat
@@ -43,7 +43,7 @@ let replace_first pat subst s =
   Bytes.unsafe_to_string buf
 ;;
 
-(* replase first occurence of pat with subst in s *)
+(* replace all occurrences of pat with subst in s *)
 let replace_all pat subst s =
   let pos = search_all pat s in
   let patl = String.length pat