diff --git a/src/demo/demo.cpp b/src/demo/demo.cpp
index 7cb0867..dd5ce48 100755
--- a/src/demo/demo.cpp
+++ b/src/demo/demo.cpp
@@ -1475,6 +1475,9 @@ while (strcmp(ch,"q") != 0) {
   case 16:
     createTask(handle, algor_vec2, 29, false);
     break;
+  case 17:
+    createTask(handle, algor_vec2, 4, false);
+    break;
   case 100:
     close_all_task(handle);
     break;