diff --git a/site/index.html b/site/index.html
index 213dd319c..462451c5e 100644
--- a/site/index.html
+++ b/site/index.html
@@ -257,7 +257,7 @@ footer .wrap{padding-block:48px 32px}
         <span><i class="sw" style="border:2px solid var(--line-2)"></i>mined</span>
         <span><i class="sw" style="background:var(--molten)"></i>shards being proven</span>
         <span><i class="sw" style="background:var(--ember)"></i>proven</span>
-        <span><i class="sw" style="border:3px solid var(--ember);border-radius:50%;background:transparent"></i>checkpoint locked by sustained miners</span>
+        <span><i class="sw" style="border:3px solid var(--ember);border-radius:50%;background:transparent"></i>checkpoint locked by sustained miners. Everything left of the line is final</span>
       </div>
     </div>
     <div class="grid" style="margin-top:24px">
@@ -501,7 +501,7 @@ footer .wrap{padding-block:48px 32px}
       blocks.forEach(function(b){b.parents.forEach(function(q){if(blocks.indexOf(q)<0)return;var both=b.state==='proven'&&q.state==='proven';x.strokeStyle=both?'rgba(242,84,27,0.45)':'rgba(154,154,158,0.22)';x.lineWidth=both?1.5:1;x.beginPath();x.moveTo(b.x,b.y);var mx=(b.x+q.x)/2;x.bezierCurveTo(mx,b.y,mx,q.y,q.x,q.y);x.stroke();});});
       // lock line: everything left of the newest locked block is final
       var lk=null;blocks.forEach(function(b){if(b.locked&&(!lk||b.x>lk.x))lk=b;});
-      if(lk){x.strokeStyle='rgba(242,84,27,0.55)';x.lineWidth=1.5;x.setLineDash([5,6]);x.beginPath();x.moveTo(lk.x,6);x.lineTo(lk.x,H-6);x.stroke();x.setLineDash([]);}
+      if(lk){x.strokeStyle='rgba(242,84,27,0.55)';x.lineWidth=1.5;x.setLineDash([5,6]);x.beginPath();x.moveTo(lk.x,6);x.lineTo(lk.x,H-6);x.stroke();x.setLineDash([]);x.fillStyle='rgba(154,154,158,0.9)';x.font='500 '+Math.max(10,Math.round(S*0.42))+'px IBM Plex Mono, monospace';x.textAlign='right';x.fillText('final',lk.x-8,H-10);}
       // blocks
       blocks.forEach(function(b){var h=S/2;
         if(b.glow>0){var g=x.createRadialGradient(b.x,b.y,0,b.x,b.y,S*1.6);g.addColorStop(0,'rgba(242,84,27,'+(0.45*b.glow)+')');g.addColorStop(1,'rgba(242,84,27,0)');x.fillStyle=g;x.beginPath();x.arc(b.x,b.y,S*1.6,0,Math.PI*2);x.fill();}