diff --git a/CHANGELOG.md b/CHANGELOG.md
index ccf6e3d9..af35a8d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 <h2>Version 4.0.0 - ??/??/2026</h2>
       <ul>
         <li>ThunderAI is now compatible only with Thunderbird 140 and later [<a href="https://github.com/micz/ThunderAI/issues/616">#616</a>].</li>
+        <li>Added a new model selector with a search functionality to dynamically filter the list [<a href="https://github.com/micz/ThunderAI/issues/603">#603</a>].</li>
         <li><i>[All APIs]</i> Added a special prompt to summarize one or more emails, using a context menu command [<a href="https://github.com/micz/ThunderAI/issues/615">#615</a>]. Thanks to <a href="https://github.com/gdkrmr">Guido Kraemer</a> for his great work on this feature.</li>
         <li><i>[All APIs]</i> "Analyze for spam" and "Add tags" context menu items are always shown when the corresponding feature is enabled [<a href="https://github.com/micz/ThunderAI/issues/609">#609</a>].</li>
         <li><i>[OpenAI Comp API][Ollama API]</i> Asking for the single host for permission to avoid CORS errors, instead of <i>all_urls</i>, as requested by the Thunderbird Review Team [<a href="https://github.com/micz/ThunderAI/issues/524">#524</a>].</li>
diff --git a/options/mzta-release-notes.html b/options/mzta-release-notes.html
index 419bdbd5..2c7ca2e7 100644
--- a/options/mzta-release-notes.html
+++ b/options/mzta-release-notes.html
@@ -10,6 +10,7 @@
       <h2>Version 4.0.0 - ??/??/2026</h2>
       <ul>
         <li>ThunderAI is now compatible only with Thunderbird 140 and later [<a href="https://github.com/micz/ThunderAI/issues/616">#616</a>].</li>
+        <li>Added a new model selector with a search functionality to dynamically filter the list [<a href="https://github.com/micz/ThunderAI/issues/603">#603</a>].</li>
         <li><i>[All APIs]</i> Added a special prompt to summarize one or more emails, using a context menu command [<a href="https://github.com/micz/ThunderAI/issues/615">#615</a>]. Thanks to <a href="https://github.com/gdkrmr">Guido Kraemer</a> for his great work on this feature.</li>
         <li><i>[All APIs]</i> "Analyze for spam" and "Add tags" context menu items are always shown when the corresponding feature is enabled [<a href="https://github.com/micz/ThunderAI/issues/609">#609</a>].</li>
         <li><i>[OpenAI Comp API][Ollama API]</i> Asking for the single host for permission to avoid CORS errors, instead of <i>all_urls</i>, as requested by the Thunderbird Review Team [<a href="https://github.com/micz/ThunderAI/issues/524">#524</a>].</li>