drawing an arrow

[胡海鹏 - Hu Haipeng]

Hello,
  I'm writing an indication for bell tree to gliss upwards. So I need an arrow pointing right-up. However, the following markup only produces an rotated triangle. Must I add a line before the arrow? Could you help me visually to create one?

Regards
Haipeng

\relative c, {
    r2 c\mp^\markup { \rotate #30 \arrow-head #X #RIGHT ##t } ~ |
    c4 r r2 |
}

 

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