I am very new to this so please forgive me if I make any errors in stating my case.
I recently received my Schengen type C Visa from Denmark. My wife and I along with some friends will be staying there for 8 days. I am the only one with a visa, as all the others are US citizens, not requiring a visa of any sort. Yesterday they mentioned they would like to go to Sweden via train for a day. I would love to go but I am wondering if I would be allowed back into Denmark, since my visa says "single entry." Of course, the visa says "SCHENGEN STATES" at the top but the thing is, I didn't mentioned Sweden in my letter so that's the cause for concern. What are you thoughts on this matter?
Updated: I've read all your comments. This really clarifies matters. I was of the impression that single entry meant you are allowed to enter a country in the Schengen area only once (in my case, once I leave Denmark to go to Sweden then I can't re-enter/ go back to Denmark) but as was mentioned, I would not be leaving and re-entering as I am still in the Schengen area. Please feel free to correct me if my understanding is wrong. Again, thank you all so very much! I appreciate it!