diff --git a/documentation/FEATURES.md b/documentation/FEATURES.md
index b8ef0db..e453aa1 100644
--- a/documentation/FEATURES.md
+++ b/documentation/FEATURES.md
@@ -59,6 +59,7 @@
 - **Drag to link** - Drag notes or images into the editor to insert links
 - **Click to navigate** - Jump between notes seamlessly
 - **External links** - Open in new tabs automatically
+- **URI protocols** - Supports `mailto:`, `tel:`, `ssh:`, `ftp:`, `slack:`, `discord:`, `teams:`, `zoom:`, `whatsapp:`, `telegram:`, `signal:`, `spotify:`, `steam:`, `magnet:`, and more
 
 ### Outline Panel
 - **Table of Contents** - View all headings (H1-H6) in sidebar
diff --git a/frontend/app.js b/frontend/app.js
index b71b9ec..7fced06 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -2580,7 +2580,9 @@ function noteApp() {
             if (!href) return;
             
             // Check if it's an external link or API path (media files, etc.)
-            if (href.startsWith('http://') || href.startsWith('https://') || href.startsWith('//') || href.startsWith('mailto:') || href.startsWith('/api/')) {
+            // Safe external protocols: http, https, mailto, tel, ssh, ftp, sftp, and app deep links
+            const externalProtocols = ['http://', 'https://', '//', 'mailto:', 'tel:', 'ssh:', 'ftp:', 'sftp:', 'slack:', 'discord:', 'teams:', 'vscode:', 'zoom:', 'whatsapp:', 'telegram:', 'signal:', 'spotify:', 'steam:', 'magnet:', '/api/'];
+            if (externalProtocols.some(p => href.startsWith(p))) {
                 return; // Let external links and API paths work normally
             }