diff --git a/pkg/emscripten/sopwith.html b/pkg/emscripten/sopwith.html
index f8d3e77..7b90a66 100644
--- a/pkg/emscripten/sopwith.html
+++ b/pkg/emscripten/sopwith.html
@@ -58,6 +58,11 @@
       function openManual() {
         window.open("doc/sopwith-emscripten.html");
       }
+      function promptForInstall() {
+        if (installPrompt != null) {
+          installPrompt.prompt();
+        }
+      }
       function programError() {
         canvas.style.visibility = "hidden";
         loadingElement.style.visibility = "visible";
@@ -111,6 +116,11 @@
           if (text) Module.printErr('[post-exception status] ' + text);
         };
       });
+      var installPrompt = null;
+      window.addEventListener("beforeinstallprompt", (event) => {
+        event.preventDefault();
+        installPrompt = event;
+      });
     </script>
 
     <script async type="text/javascript" src="sopwith.js"></script>
diff --git a/src/swtitle.c b/src/swtitle.c
index acb5f7c..c205eb7 100644
--- a/src/swtitle.c
+++ b/src/swtitle.c
@@ -220,6 +220,7 @@ void getgamemode(void)
 #endif
 #ifdef __EMSCRIPTEN__
 		swputs("     M - open manual\n");
+		swputs("     I - install as app\n");
 #endif
 		Vid_Update();
 
@@ -255,6 +256,9 @@ void getgamemode(void)
 			break;
 #endif
 #ifdef __EMSCRIPTEN__
+		case 'I':
+			emscripten_run_script("promptForInstall()");
+			break;
 		case 'M':
 			emscripten_run_script("openManual()");
 			break;