diff --git a/modules/mining-checker/assets/js/app.js b/modules/mining-checker/assets/js/app.js
index 993e3e7..c5098de 100644
--- a/modules/mining-checker/assets/js/app.js
+++ b/modules/mining-checker/assets/js/app.js
@@ -438,6 +438,11 @@
   }
 
   function SimpleChart(props) {
+    function pointTooltip(seriesLabel, point) {
+      const label = seriesLabel ? `${seriesLabel} · ` : '';
+      return `${label}${String(point.x)}: ${fmtNumber(point.y, 6)}`;
+    }
+
     const series = Array.isArray(props.series)
       ? props.series
           .map((item, index) => ({
@@ -529,7 +534,9 @@
                 height: height - padding - coord[1],
                 rx: 8,
                 fill: 'rgba(59, 130, 246, 0.75)',
-              });
+              }, [
+                h('title', { key: 'title' }, pointTooltip(seriesCoords[0].label, seriesCoords[0].data[index])),
+              ]);
             }))
           : h('g', { key: 'series' }, seriesCoords.flatMap((item, index) => {
               const nodes = [];
@@ -557,7 +564,9 @@
                 fill: '#f8fafc',
                 stroke: item.color,
                 strokeWidth: 2,
-              }))));
+              }, [
+                h('title', { key: 'title' }, pointTooltip(item.label, item.data[pointIndex])),
+              ]))));
               return nodes;
             })),
       ]),