diff --git a/cmd/server/openapi.go b/cmd/server/openapi.go
index f4fcbdc9..cf89ca16 100644
--- a/cmd/server/openapi.go
+++ b/cmd/server/openapi.go
@@ -447,7 +447,7 @@ func componentSchemas() map[string]interface{} {
 				"mostEfficientPing":   schemaRef("PingScore"),
 				"relayLeaderboard":    map[string]interface{}{"type": "array", "items": schemaRef("PingLeaderboardEntry"), "description": "Top nodes ranked by number of distinct pings they appeared as a relay hop in (deduped per ping first, so one busy ping's many branches can't over-credit a relay)."},
 				"observerLeaderboard": map[string]interface{}{"type": "array", "items": schemaRef("PingLeaderboardEntry"), "description": "Top observers ranked by number of pings they were the first station to hear."},
-				"senderLeaderboard":   map[string]interface{}{"type": "array", "items": schemaRef("PingLeaderboardEntry"), "description": "Top senders ranked by number of pings sent. Keyed by the sender display name from the channel message itself -- no resolved pubkey, so entries never carry one."},
+				"senderLeaderboard":   map[string]interface{}{"type": "array", "items": schemaRef("PingLeaderboardEntry"), "description": "Top senders ranked by number of pings sent in the last 30 days (unlike the other leaderboards and records, which are all-time). Keyed by the sender display name from the channel message itself -- no resolved pubkey, so entries never carry one."},
 			},
 		},
 		"AreaDensity": map[string]interface{}{
diff --git a/public/ping-scores.js b/public/ping-scores.js
index 341d77d2..ef777ada 100644
--- a/public/ping-scores.js
+++ b/public/ping-scores.js
@@ -125,7 +125,7 @@
       '<p class="text-muted">Global records and leaderboards from every "ping" sent in any channel (' + data.totalPings + ' total). Not scoped by region. Updated ' + escapeHtml(formatAgo(data.generatedAt)) + '.</p>' +
       '<div class="stats-grid ps-records-grid">' + recordsHtml + '</div>' +
       '<div class="ps-leaderboards-grid">' +
-        leaderboardTableHtml('Top Senders', phIcon('megaphone'), data.senderLeaderboard, 'Sender') +
+        leaderboardTableHtml('Top Senders (30 days)', phIcon('megaphone'), data.senderLeaderboard, 'Sender') +
         leaderboardTableHtml('Top Relays', phIcon('repeat'), data.relayLeaderboard) +
         leaderboardTableHtml('Top First-Hearers', phIcon('eye'), data.observerLeaderboard) +
       '</div>' +
diff --git a/test-ping-scores.js b/test-ping-scores.js
index 22ed9b21..096f29b9 100644
--- a/test-ping-scores.js
+++ b/test-ping-scores.js
@@ -136,7 +136,7 @@ function makeSandbox(apiImpl) {
       assert.ok(container.innerHTML.includes('RelayOne'), 'should show the relay leaderboard entry, got: ' + container.innerHTML);
       assert.ok(container.innerHTML.includes('ObsOne'), 'should show the observer leaderboard entry, got: ' + container.innerHTML);
       assert.ok(container.innerHTML.includes('PingMaster'), 'should show the sender leaderboard entry, got: ' + container.innerHTML);
-      assert.ok(container.innerHTML.includes('Top Senders'), 'should show the Top Senders leaderboard heading, got: ' + container.innerHTML);
+      assert.ok(container.innerHTML.includes('Top Senders (30 days)'), 'should show the Top Senders leaderboard heading with the 30-day window noted, got: ' + container.innerHTML);
       passed++;
       console.log('  ✅ renders all 5 records and all three leaderboards (including Top Senders) from a populated response');
     } catch (e) { failed++; console.log('  ❌ renders all 5 records and all three leaderboards (including Top Senders) from a populated response: ' + e.message); }