diff --git a/script.js b/script.js
index 82e1601..b7b09b7 100644
--- a/script.js
+++ b/script.js
@@ -764,7 +764,9 @@ function showEonstripDetail(index, startCob) {
                     start: relStart,
                     end: relEnd,
                     cobStart: occ,
-                    cobEnd: occ + duration
+                    cobEnd: occ + duration,
+                    seriesStart: startCobEv,
+                    seriesEnd: endCobEv
                 });
                 occ += interval;
             }
@@ -813,21 +815,26 @@ function showEonstripDetail(index, startCob) {
 
             const tooltip = document.createElement('div');
             tooltip.className = 'tooltip';
-            const opts = {
+            const optsShort = {
                 timeZone: currentTimezone === 'TAI' ? 'UTC' : currentTimezone,
                 year: 'numeric', month: 'short', day: 'numeric',
-                hour: '2-digit', minute: '2-digit', second: '2-digit',
+                hour: '2-digit', minute: '2-digit',
                 hour12: false
             };
-            const startStr = formatCobieTimestamp(ev.cobStart);
-            const endStr   = formatCobieTimestamp(ev.cobEnd);
-            const startDate = fromCobiets(ev.cobStart).toLocaleString('en-US', opts);
-            const endDate   = fromCobiets(ev.cobEnd).toLocaleString('en-US', opts);
+
+            const startStr    = formatCobieTimestamp(ev.cobStart);
+            const endStr      = formatCobieTimestamp(ev.cobEnd);
+            const startDate   = fromCobiets(ev.cobStart).toLocaleString('en-US', optsShort);
+            const endDate     = fromCobiets(ev.cobEnd).toLocaleString('en-US', optsShort);
+            const seriesStart = formatCobieTimestamp(ev.seriesStart);
+            const seriesEnd   = isFinite(ev.seriesEnd) ?
+                formatCobieTimestamp(ev.seriesEnd) : '∞';
+
             tooltip.innerHTML =
                 `<strong>${ev.label}</strong><br>` +
-                `Start: ${startStr}<br>` +
-                `End: ${endStr}<br>` +
-                `${startDate} – ${endDate}`;
+                `Start: ${startStr} (${startDate})<br>` +
+                `End: ${endStr} (${endDate})<br>` +
+                `Series: ${seriesStart} – ${seriesEnd}`;
             elem.appendChild(tooltip);
         timeline.appendChild(elem);
         });