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-rw-r--r--stdlib/bytesLabels.mli4
1 files changed, 3 insertions, 1 deletions
diff --git a/stdlib/bytesLabels.mli b/stdlib/bytesLabels.mli
index d48d95f5c..04043182f 100644
--- a/stdlib/bytesLabels.mli
+++ b/stdlib/bytesLabels.mli
@@ -11,7 +11,9 @@
(* *)
(***********************************************************************)
-(** Byte sequence operations. *)
+(** Byte sequence operations.
+ @since 4.02.0
+ *)
external length : bytes -> int = "%string_length"
(** Return the length (number of bytes) of the argument. *)