diff --git a/legacy/elementary/src/lib/elm_label.c b/legacy/elementary/src/lib/elm_label.c
index f2e4307bf9..cbafd1b1cc 100644
--- a/legacy/elementary/src/lib/elm_label.c
+++ b/legacy/elementary/src/lib/elm_label.c
@@ -72,6 +72,7 @@ _label_slide_change(Evas_Object *obj)
    if (sd->linewrap)
      {
         sd->slide = EINA_FALSE;
+        WRN("Doesn't support slide effect for multiline! : label=%p", obj);
         return;
      }
 
diff --git a/legacy/elementary/src/lib/elm_label.h b/legacy/elementary/src/lib/elm_label.h
index ccb79a227d..444e88ad40 100644
--- a/legacy/elementary/src/lib/elm_label.h
+++ b/legacy/elementary/src/lib/elm_label.h
@@ -285,6 +285,8 @@ EAPI Eina_Bool                   elm_label_ellipsis_get(const Evas_Object *obj);
  *
  * @warning This only works with the themes "slide_short", "slide_long" and
  * "slide_bounce".
+ * @warning This doesn't work if the line wrap(elm_label_line_wrap_set()) or
+ * ellipsis(elm_label_ellipsis_set()) is set.
  *
  * @ingroup Label
  */