I added a valid external link that had everything to do with the page in question.  The link to the site I added is not owned by me nor am I associated with that site in any other way except that I use it and find it relevant.  You, and evety other editor on this site are way to liberal with that "spam" word and the "advertising" claim.  What about the other links on that page?  Did you accuse them of spamming too?