Beyoncé has made an appearance in a new promotional video for World Humanitarian Day.

The day commemorates humanitarian causes and those who have died working for the humanitarian greater good.

Beyoncé had recently posted a cryptic message on her website, saying: "Leave your footprint on 19th August 2012."

Puzzled fans can now put two and two together after a video was released featuring Beyoncé to promote this year's World Humanitarian Day, which takes place on August 19.

Beyoncé calls on viewers to help out other human beings on August 19, no matter how small the act may be. She said:

"On August 19th, 2012, it's high time we rise together. Do one thing for another human being. Nothing is too small. It begins with each of us. Make your mark and say 'I was here'."

The video ends with a clip of Beyonce's song 'I Was Here', which is the tagline for the campaign.