diff --git a/src/sequenceLabels.mli b/src/sequenceLabels.mli
index d764c69..7b51d97 100644
--- a/src/sequenceLabels.mli
+++ b/src/sequenceLabels.mli
@@ -118,14 +118,16 @@ val exists : f:('a -> bool) -> 'a t -> bool
 
 val mem : ?eq:('a -> 'a -> bool) -> x:'a -> 'a t -> bool
 (** Is the value a member of the sequence?
-    @param eq the equality predicate to use (default [(=)]) *)
+    @param eq the equality predicate to use (default [(=)])
+    @since 0.5 *)
 
-val find : f:('a -> 'b option) -> 'a t -> 'b option
-(** Find the first element on which the function doesn't return [None] *)
+val find : ('a -> 'b option) -> 'a t -> 'b option
+(** Find the first element on which the function doesn't return [None]
+    @since 0.5 *)
 
 val find_map : f:('a -> 'b option) -> 'a t -> 'b option
 (** Alias to {!find}
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 val findi : f:(int -> 'a -> 'b option) -> 'a t -> 'b option
 (** Indexed version of {!find}
@@ -133,7 +135,7 @@ val findi : f:(int -> 'a -> 'b option) -> 'a t -> 'b option
 
 val find_mapi : f:(int -> 'a -> 'b option) -> 'a t -> 'b option
 (** Alias to {!findi}
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 val find_pred : f:('a -> bool) -> 'a t -> 'a option
 (** [find_pred p l] finds the first element of [l] that satisfies [p],
@@ -160,6 +162,11 @@ val append : 'a t -> 'a t -> 'a t
 (** Append two sequences. Iterating on the result is like iterating
     on the first, then on the second. *)
 
+val append_l : 'a t list -> 'a t
+(** Append sequences. Iterating on the result is like iterating
+    on the each sequence of the list in order.
+    @since NEXT_RELEASE *)
+
 val concat : 'a t t -> 'a t
 (** Concatenate a sequence of sequences into one sequence. *)
 
@@ -235,6 +242,7 @@ val group_by : ?hash:('a -> int) -> ?eq:('a -> 'a -> bool) ->
   'a t -> 'a list t
 (** Group equal elements, disregarding their order of appearance.
     The result sequence is traversable as many times as required.
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
     @since 0.6 *)
 
 val count : ?hash:('a -> int) -> ?eq:('a -> 'a -> bool) ->
@@ -264,7 +272,8 @@ val diagonal : 'a t -> ('a * 'a) t
     @since 0.9 *)
 
 val product2 : 'a t -> 'b t -> ('a, 'b) t2
-(** Binary version of {!product}. Same requirements. *)
+(** Binary version of {!product}. Same requirements.
+    @since 0.5 *)
 
 val join : join_row:('a -> 'b -> 'c option) -> 'a t -> 'b t -> 'c t
 (** [join ~join_row a b] combines every element of [a] with every
@@ -284,7 +293,8 @@ val join_by : ?eq:'key equal -> ?hash:'key hash ->
     values [(x,y)] from [(a,b)] with the same [key]
     using [merge]. If [merge] returns [None], the combination
     of values is discarded.
-    @since NEXT_RELEASE *)
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
+    @since 0.10 *)
 
 val join_all_by : ?eq:'key equal -> ?hash:'key hash ->
   ('a -> 'key) -> ('b -> 'key) ->
@@ -301,7 +311,7 @@ val join_all_by : ?eq:'key equal -> ?hash:'key hash ->
     - call [merge k l1 l2]. If [merge] returns [None], the combination
       of values is discarded, otherwise it returns [Some c]
       and [c] is inserted in the result.
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 val group_join_by : ?eq:'a equal -> ?hash:'a hash ->
   ('b -> 'a) ->
@@ -313,14 +323,16 @@ val group_join_by : ?eq:'a equal -> ?hash:'a hash ->
     sequence such that [eq x (key y)]. Elements of the first
     sequences without corresponding values in the second one
     are mapped to [[]]
-    @since NEXT_RELEASE *)
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
+    @since 0.10 *)
 
 val inter :
   ?eq:'a equal -> ?hash:'a hash ->
   'a t -> 'a t -> 'a t
 (** Intersection of two collections. Each element will occur at most once
     in the result. Eager.
-    @since NEXT_RELEASE *)
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
+    @since 0.10 *)
 
 (*$=
   [2;4;5;6] (inter (1--6) (cons 2 (4--10)) |> sort |> to_list)
@@ -332,7 +344,8 @@ val union :
   'a t -> 'a t -> 'a t
 (** Union of two collections. Each element will occur at most once
     in the result. Eager.
-    @since NEXT_RELEASE *)
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
+    @since 0.10 *)
 
 (*$=
   [2;4;5;6] (union (4--6) (cons 2 (4--5)) |> sort |> to_list)
@@ -342,7 +355,7 @@ val diff :
   ?eq:'a equal -> ?hash:'a hash ->
   'a t -> 'a t -> 'a t
 (** Set difference. Eager.
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 (*$=
   [1;2;8;9;10] (diff (1--10) (3--7) |> to_list)
@@ -352,7 +365,8 @@ val subset :
   ?eq:'a equal -> ?hash:'a hash ->
   'a t -> 'a t -> bool
 (** [subset a b] returns [true] if all elements of [a] belong to [b]. Eager.
-    @since NEXT_RELEASE *)
+    precondition: for any [x] and [y], if [eq x y] then [hash x=hash y] must hold.
+    @since 0.10 *)
 
 (*$T
   subset (2 -- 4) (1 -- 4)
@@ -375,7 +389,7 @@ val max : ?lt:('a -> 'a -> bool) -> 'a t -> 'a option
 val max_exn : ?lt:('a -> 'a -> bool) -> 'a t -> 'a
 (** Unsafe version of {!max}
     @raise Not_found if the sequence is empty
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 val min : ?lt:('a -> 'a -> bool) -> 'a t -> 'a option
 (** Min element of the sequence, using the given comparison function.
@@ -384,7 +398,7 @@ val min : ?lt:('a -> 'a -> bool) -> 'a t -> 'a option
 val min_exn : ?lt:('a -> 'a -> bool) -> 'a t -> 'a
 (** Unsafe version of {!min}
     @raise Not_found if the sequence is empty
-    @since NEXT_RELEASE *)
+    @since 0.10 *)
 
 val sum : int t -> int
 (** Sum of elements
@@ -395,11 +409,13 @@ val sumf : float t -> float
     @since NEXT_RELEASE *)
 
 val head : 'a t -> 'a option
-(** First element, if any, otherwise [None] *)
+(** First element, if any, otherwise [None]
+    @since 0.5.1 *)
 
 val head_exn : 'a t -> 'a
 (** First element, if any, fails
-    @raise Invalid_argument if the sequence is empty *)
+    @raise Invalid_argument if the sequence is empty
+    @since 0.5.1 *)
 
 val take : int -> 'a t -> 'a t
 (** Take at most [n] elements from the sequence. Works on infinite
@@ -412,7 +428,8 @@ val take_while : f:('a -> bool) -> 'a t -> 'a t
 
 val fold_while : f:('a -> 'b -> 'a * [`Stop | `Continue]) -> init:'a -> 'b t -> 'a
 (** Folds over elements of the sequence, stopping early if the accumulator
-    returns [('a, `Stop)] *)
+    returns [('a, `Stop)]
+    @since 0.5.5 *)
 
 val drop : int -> 'a t -> 'a t
 (** Drop the [n] first elements of the sequence. Lazy. *)
@@ -471,7 +488,8 @@ val pair_with_idx : 'a t -> (int * 'a) t
     @since NEXT_RELEASE *)
 
 val to_opt : 'a t -> 'a option
-(** Alias to {!head} *)
+(** Alias to {!head}
+    @since 0.5.1 *)
 
 val to_array : 'a t -> 'a array
 (** Convert to an array. Currently not very efficient because
@@ -489,7 +507,8 @@ val array_slice : 'a array -> int -> int -> 'a t
     from [i] to [j] *)
 
 val of_opt : 'a option -> 'a t
-(** Iterate on 0 or 1 values. *)
+(** Iterate on 0 or 1 values.
+    @since 0.5.1 *)
 
 val of_stream : 'a Stream.t -> 'a t
 (** Sequence of elements of a stream (usable only once) *)
@@ -537,7 +556,8 @@ val to_str :  char t -> string
 
 val concat_str : string t -> string
 (** Concatenate strings together, eagerly.
-    Also see {!intersperse} to add a separator. *)
+    Also see {!intersperse} to add a separator.
+    @since 0.5 *)
 
 exception OneShotSequence
 (** Raised when the user tries to iterate several times on