diff --git a/lib/host/otel.sx b/lib/host/otel.sx
index 08539ba2..3d0c1b3a 100644
--- a/lib/host/otel.sx
+++ b/lib/host/otel.sx
@@ -213,11 +213,15 @@
   (fn (status) (if (= status "error") "#e45756" "#4c9a8f")))
 
 ;; one <g> (bar + name + duration) per rect. The bar is the only <rect>, so
-;; count(rect) == count(span); axis chrome uses <line>/<text>.
+;; count(rect) == count(span); axis chrome uses <line>/<text>. A leading <title>
+;; gives a native hover tooltip with the full span name (the inline label clips on
+;; narrow bars).
 (define otel/-rect->g
   (fn (r)
     (quasiquote
       (g
+        (title (unquote (str (get r :name) " · " (otel/-ms (get r :dur))
+                             (if (= (get r :status) "error") " · error" ""))))
         (rect :x (unquote (get r :x)) :y (unquote (get r :y))
               :width (unquote (get r :w)) :height (unquote (- otel/-row-h 2))
               :fill (unquote (otel/-bar-fill (get r :status))) :rx 2)