diff --git a/fuzz/fuzz.ml b/fuzz/fuzz.ml
index 75d2cfd..4eca505 100644
--- a/fuzz/fuzz.ml
+++ b/fuzz/fuzz.ml
@@ -83,10 +83,10 @@ let () =
     );
   add_test ~name:"shiftv" [list cstruct; int] (fun ts n ->
       match Cstruct.shiftv ts n with
-      | exception Invalid_argument _ -> check (n < 0 || n > Cstruct.lenv ts)
+      | exception Invalid_argument _ -> check (n < 0 || n > Cstruct.lengthv ts)
       | ts' ->
         assert (Cstruct.equal (Cstruct.concat ts') (Cstruct.shift (Cstruct.concat ts) n));
-        assert ((Cstruct.lenv ts = n) = (ts' = []));
+        assert ((Cstruct.lengthv ts = n) = (ts' = []));
         match ts' with
         | hd :: _ -> assert (not (Cstruct.is_empty hd))
         | [] -> ()
@@ -142,21 +142,21 @@ let () =
       | () -> check in_range
       | exception Invalid_argument _ -> check (not in_range)
     );
-  add_test ~name:"lenv" [list cstruct] (fun cs ->
-      check (Cstruct.lenv cs >= 0)
+  add_test ~name:"lengthv" [list cstruct] (fun cs ->
+      check (Cstruct.lengthv cs >= 0)
     );
   add_test ~name:"copyv" [list cstruct] (fun cs ->
       check (String.equal (Cstruct.copyv cs) (Cstruct.concat cs |> Cstruct.to_string))
     );
   add_test ~name:"fillv" [list cstruct; cstruct] (fun src dst ->
       let copied, rest = Cstruct.fillv ~src ~dst in
-      check (copied + Cstruct.lenv rest = Cstruct.lenv src);
+      check (copied + Cstruct.lengthv rest = Cstruct.lengthv src);
       (* OCaml tends to underestimate how much space bigarrays are using: *)
       Gc.minor ()
     );
   add_test ~name:"concat" [list cstruct] (fun cs ->
       let x = Cstruct.concat cs in
-      check (Cstruct.length x = Cstruct.lenv cs)
+      check (Cstruct.length x = Cstruct.lengthv cs)
     );
   add_test ~name:"span" [ cstruct; list char ] (fun cs p ->
       let sat chr = List.exists ((=) chr) p in
diff --git a/lib/cstruct.ml b/lib/cstruct.ml
index 5c4b871..903bac4 100644
--- a/lib/cstruct.ml
+++ b/lib/cstruct.ml
@@ -369,6 +369,7 @@ let rec sum_lengths_aux ~caller acc = function
 let sum_lengths ~caller l = sum_lengths_aux ~caller 0 l
 
 let lenv l = sum_lengths ~caller:"Cstruct.lenv" l
+let lengthv l = sum_lengths ~caller:"Cstruct.lengthv" l
 
 let copyv ts =
   let sz = sum_lengths ~caller:"Cstruct.copyv" ts in
diff --git a/lib/cstruct.mli b/lib/cstruct.mli
index fd5b081..04e8114 100644
--- a/lib/cstruct.mli
+++ b/lib/cstruct.mli
@@ -504,10 +504,14 @@ val debug: t -> string
 
 (** {2 List of buffers} *)
 
-val lenv: t list -> int
-(** [lenv cstrs] is the combined length of all cstructs in [cstrs].
+val lengthv: t list -> int
+(** [lengthv cstrs] is the combined length of all cstructs in [cstrs].
     @raise Invalid_argument if computing the sum overflows. *)
 
+val lenv : t list -> int
+[@@ocaml.alert deprecated "use lengthv instead"]
+(** [lenv] is deprecated in favor of [lengthv]. *)
+
 val copyv: t list -> string
 (** [copyv cstrs] is the string representation of the concatenation of
     all cstructs in [cstrs].
@@ -524,7 +528,7 @@ val shiftv: t list -> int -> t list
     It has the property that [equal (concat (shiftv ts n)) (shift (concat ts) n)].
     This operation is fairly fast, as it will share the tail of the list.
     The first item in the returned list is never an empty cstruct,
-    so you'll get [[]] if and only if [lenv ts = n]. *)
+    so you'll get [[]] if and only if [lengthv ts = n]. *)
 
 (** {2 Iterations} *)
 
diff --git a/lib/cstruct_cap.mli b/lib/cstruct_cap.mli
index cc73438..7c93097 100644
--- a/lib/cstruct_cap.mli
+++ b/lib/cstruct_cap.mli
@@ -114,11 +114,15 @@ val check_alignment : 'a t -> int -> bool
 
     @raise Invalid_argument if [alignment] is not a positive integer. *)
 
-val lenv : 'a t list -> int
-(** [lenv vs] is the combined length of all {!t} in [vs].
+val lengthv : 'a t list -> int
+(** [lengthv vs] is the combined length of all {!t} in [vs].
 
     @raise Invalid_argument if computing the sum overflows. *)
 
+val lenv : 'a t list -> int
+[@@ocaml.alert deprecated "use lengthv instead"]
+(** [lenv] is deprecated in favor of [lengthv]. *)
+
 (** {2 Constructors} *)
 
 val create : int -> rdwr t
@@ -166,7 +170,7 @@ val shiftv: 'a t list -> int -> 'a t list
     It has the property that [equal (concat (shiftv ts n)) (shift (concat ts) n)].
     This operation is fairly fast, as it will share the tail of the list.
     The first item in the returned list is never an empty cstruct,
-    so you'll get [[]] if and only if [lenv ts = n]. *)
+    so you'll get [[]] if and only if [lengthv ts = n]. *)
 
 val split : ?start:int -> 'a t -> int -> 'a t * 'a t
 (** [split ~start t len] returns two proxies extracted from [t]. The first
@@ -190,7 +194,7 @@ val append : 'a rd t -> 'b rd t -> rdwr t
     the returned value has both read and write capabilities. *)
 
 val concat : 'a rd t list -> rdwr t
-(** [concat vss] allocates a buffer [r] of size [lenv vss]. Each [v] of [vss]
+(** [concat vss] allocates a buffer [r] of size [lengthv vss]. Each [v] of [vss]
     is copied into the buffer [r]. Each [v] of [vss] need at least read
     capability {!rd}, the returned value has both read and write capabilities.
 *)
diff --git a/lib_test/bounds.ml b/lib_test/bounds.ml
index 71cbb3b..8c3e545 100644
--- a/lib_test/bounds.ml
+++ b/lib_test/bounds.ml
@@ -347,14 +347,14 @@ let test_view_bounds_too_small_get_he64 () =
   with
     Invalid_argument _ -> ()
 
-let test_lenv_overflow () =
+let test_lengthv_overflow () =
   if Sys.word_size = 32 then (
     (* free-up some space *)
     Gc.major ();
     let b = Cstruct.create max_int and c = Cstruct.create 3 in
     try
-      let _ = Cstruct.lenv [b; b; c] in
-      failwith "test_lenv_overflow"
+      let _ = Cstruct.lengthv [b; b; c] in
+      failwith "test_lengthv_overflow"
     with
       Invalid_argument _ -> ())
 
@@ -494,7 +494,7 @@ let suite = [
   "test_view_bounds_too_small_get_he16" , `Quick, test_view_bounds_too_small_get_he16;
   "test_view_bounds_too_small_get_he32" , `Quick, test_view_bounds_too_small_get_he32;
   "test_view_bounds_too_small_get_he64" , `Quick, test_view_bounds_too_small_get_he64;
-  "test_lenv_overflow", `Quick, test_lenv_overflow;
+  "test_lengthv_overflow", `Quick, test_lengthv_overflow;
   "test_copyv_overflow", `Quick, test_copyv_overflow;
   "test_subview_containment_get_char", `Quick, test_subview_containment_get_char;
   "test_subview_containment_get_8"   , `Quick, test_subview_containment_get_8;
diff --git a/lib_test/tests.ml b/lib_test/tests.ml
index be57b9b..f0cd723 100644
--- a/lib_test/tests.ml
+++ b/lib_test/tests.ml
@@ -88,7 +88,7 @@ let append_is_concat ~n () =
 let fillv () =
   let test src buf_size =
     let dst = Cstruct.create buf_size in
-    let src_len = Cstruct.lenv src in
+    let src_len = Cstruct.lengthv src in
     let len, remaining = Cstruct.fillv ~src ~dst in
     assert (len = min src_len buf_size);
     let whole = Cstruct.concat (Cstruct.sub dst 0 len :: remaining) in