Open house compensation

[Claire Zhang]

Hi, I hosted an open house last weekend and one of my colleagues came to help unannounced. The open house was busy so he helped out and show the property with few buyers. One of the buyers He helped made an offer. Am I suppose to compensate my colleague if the deal go thru and how much Normally if so? The colleagues has been helping and following up with the buyer to get the offer after open house.