diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3deb0b4c..8a89eab1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
       <ul>
         <li><i>[OpenAI API]</i> Model filtering improved when choosing a model in the options page.</li>
         <li><i>[OpenAI API]</i> Now using the new Responses API [<a href="https://github.com/micz/ThunderAI/issues/407">#407</a>].</li>
+        <li>It is now possible to define a custom placeholder with dynamic data to retrieve any header present in the current email [<a href="https://github.com/micz/ThunderAI/issues/527">#527</a>].</li>
         <li>...</li>
       </ul>
 <h2>Version 3.7.8 - 18/12/2025</h2>
diff --git a/options/mzta-release-notes.html b/options/mzta-release-notes.html
index 7f5c8c31..5b49f47c 100644
--- a/options/mzta-release-notes.html
+++ b/options/mzta-release-notes.html
@@ -11,6 +11,7 @@
       <ul>
         <li><i>[OpenAI API]</i> Model filtering improved when choosing a model in the options page.</li>
         <li><i>[OpenAI API]</i> Now using the new Responses API [<a href="https://github.com/micz/ThunderAI/issues/407">#407</a>].</li>
+        <li>It is now possible to define a custom placeholder with dynamic data to retrieve any header present in the current email [<a href="https://github.com/micz/ThunderAI/issues/527">#527</a>].</li>
         <li>...</li>
       </ul>
       <h2>Version 3.7.8 - 18/12/2025</h2>