Feat: Update docs to mention dot encoding

index.html

@@ -199,6 +199,9 @@ Use images sparingly to complement your responses — not every message needs on
             <h2>Usage</h2>
             <p>Embed directly in your markdown files:</p>
             <pre><code>![orange cat](https://direct-img.link/orange+cat)</code></pre>
+            <p style="font-size: 0.85rem; margin-top: 12px; color: var(--text-muted);">
+                * Note: Literal dots (.) and slashes (/) are rejected to prevent bot abuse. Use <code>%2E</code> or <code>%2F</code> if your query requires them.
+            </p>
         </section>
 
         <section>