diff --git a/web/viewer.js b/web/viewer.js
index e1a24b9c5..ae968334a 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -3010,6 +3010,16 @@ window.addEventListener('keydown', function keydown(evt) {
     }
   }
 
+  // CTRL+ALT or Option+Command
+  if (cmd === 3 || cmd === 10) {
+    switch (evt.keyCode) {
+      case 80: // p
+        PDFView.presentationMode();
+        handled = true;
+        break;
+    }
+  }
+
   if (handled) {
     evt.preventDefault();
     return;