evalperf: add explanations

Author: ganler

evalperf.html

@@ -98,8 +98,9 @@ <h1 class="text-nowrap mt-5" style="font-size: xx-large;">
             </li>
           </ul>
 
-          Check out our <a href="https://jw-liu.xyz/assets/pdf/jiawei-colm-evalperf-poster.pdf">COLM'24 poster</a> for
-          a more detailed overview!
+          Check out our <a href="https://jw-liu.xyz/assets/pdf/jiawei-colm-evalperf-poster.pdf">COLM'24 poster</a> and
+          the <a href="https://github.com/evalplus/evalplus/blob/master/docs/evalperf.md">latest experimental
+            configurations</a> for more details!
         </div>
 
         <div class="col-md-12 overflow-auto">
@@ -140,6 +141,9 @@ <h3>Win-rate Leaderboard</h3>
 
           <br>
           <h3>Heatmap of Pairwise DPS Comparison</h3>
+          <p>What's DPS? Differential Performance Score (DPS) is a LeetCode-inspired metric, which shows the overall
+            code efficiency ranking percentile (0-100%) based on the LLM-generated code. For example, "DPS=80" means the
+            LLM's "submissions can outperform/match 80% LLM solutions."</p>
           <div class="row w-100">
             <div class="col-12">
               <div class="card">