diff --git a/src/core/collector.ml b/src/core/collector.ml
index 2ccdd37..93f8faa 100644
--- a/src/core/collector.ml
+++ b/src/core/collector.ml
@@ -53,7 +53,7 @@ module type S = sig
   (** Exit an explicit span.
       @since 0.3 *)
 
-  val add_data : (string * user_data) list -> unit
+  val add_data_to_current_span : (string * user_data) list -> unit
   (** @since Adds data to the current, implicit span.
       NEXT_RELEASE *)
 
diff --git a/src/core/trace_core.ml b/src/core/trace_core.ml
index d89ed8c..2c4a072 100644
--- a/src/core/trace_core.ml
+++ b/src/core/trace_core.ml
@@ -55,11 +55,11 @@ let[@inline] exit_manual_span espan : unit =
   | None -> ()
   | Some (module C) -> C.exit_manual_span espan
 
-let[@inline] add_data data : unit =
+let[@inline] add_data_to_current_span data : unit =
   if data <> [] then (
     match A.get collector with
     | None -> ()
-    | Some (module C) -> C.add_data data
+    | Some (module C) -> C.add_data_to_current_span data
   )
 
 let[@inline] add_data_to_manual_span esp data : unit =
diff --git a/src/core/trace_core.mli b/src/core/trace_core.mli
index f5394ff..a1f335e 100644
--- a/src/core/trace_core.mli
+++ b/src/core/trace_core.mli
@@ -34,7 +34,7 @@ val with_span :
     see {!enter_manual_span}.
 *)
 
-val add_data : (string * user_data) list -> unit
+val add_data_to_current_span : (string * user_data) list -> unit
 (** Add structured data to the current, implicit span (see {!with_span}).
     Behavior is not specified if there is no current span.
     @since NEXT_RELEASE *)
diff --git a/src/tef/trace_tef.ml b/src/tef/trace_tef.ml
index acbc77f..2020c9e 100644
--- a/src/tef/trace_tef.ml
+++ b/src/tef/trace_tef.ml
@@ -410,7 +410,7 @@ let collector ~out () : collector =
 
       Fun.protect ~finally (fun () -> f span)
 
-    let add_data data =
+    let add_data_to_current_span data =
       if data <> [] then (
         let tid = get_tid_ () in
         B_queue.push events (E_add_data { tid; data })
diff --git a/test/t1.ml b/test/t1.ml
index 49ff68f..b4db240 100644
--- a/test/t1.ml
+++ b/test/t1.ml
@@ -17,10 +17,10 @@ let run () =
       Trace.message "world";
       Trace.counter_int "n" !n;
 
-      Trace.add_data [ "i", `Int _i ];
+      Trace.add_data_to_current_span [ "i", `Int _i ];
 
       if _j = 2 then (
-        Trace.add_data [ "j", `Int _j ];
+        Trace.add_data_to_current_span [ "j", `Int _j ];
         let _sp =
           Trace.enter_manual_sub_span ~parent:pseudo_async_sp
             ~flavor: