Community Guidelines about posting promotions & links:
Advertising and solicitation
Posts that include advertising, solicitation or promotions may be removed. Members intent on spamming our communities may find their posting privileges revoked without additional warning.
Including links to informative and helpful sites is part of Internet communication. Choosing to click on a link is your decision. We do not screen links. However, posts may be removed if a hyperlink is not in the following format -- www.wheredoesthislinkgo.com or .org or any number of acceptable addresses. The key here is no hidden agendas. Tell us where the link goes so our members may make informed decisions on whether to click or not. Remember: We do not screen links in posts, but may remove a post if the link is determined to be inappropriate.
Based on your post above, you have explained what the link would go to ... enough for people to make an informed decision.