diff --git a/_includes/sections/cloud-storage.html b/_includes/sections/cloud-storage.html
index c2cd01c6..f88e56d0 100644
--- a/_includes/sections/cloud-storage.html
+++ b/_includes/sections/cloud-storage.html
@@ -26,6 +26,6 @@ googleplay="https://play.google.com/store/apps/details?id=com.nextcloud.client"
 <h3>Worth Mentioning</h3>
 
 <ul>
-  <li><a href="https://cryptomator.org/">Cryptomator</a> - Free client-side AES encryption for your cloud files. Open source software: No backdoors, no registration.</li>
+  <li><a href="https://cryptomator.org/">Cryptomator</a> - Free client-side AES encryption for your cloud files. Open source software: No backdoors, no registration. <span class="badge badge-warning" data-toggle="tooltip" title="Cryptomator's mobile apps are not open-source."><a href="https://github.com/cryptomator/cryptomator-android/issues/1#issuecomment-257979375"><i class="fas fa-exclamation-triangle"></i></a></span></li>
   <li><a href="https://cryptpad.fr">CryptPad</a> - Free and end-to-end encrypted real time collaboration sharing folders, media, and documents.</li>
 </ul>