diff --git a/src/Tiny_httpd.mli b/src/Tiny_httpd.mli
index ea23a1e1..27ef44d7 100644
--- a/src/Tiny_httpd.mli
+++ b/src/Tiny_httpd.mli
@@ -472,6 +472,10 @@ val is_ipv6 : t -> bool
 val port : t -> int
 (** Port on which the server listens. *)
 
+val active_connections : t -> int
+(** number of currently opened connections with a client.
+    @since 0.11 *)
+
 val add_decode_request_cb :
   t ->
   (unit Request.t -> (unit Request.t * (byte_stream -> byte_stream)) option) -> unit