Hello, 519greenvalley, and Welcome to Wikipedia! Thank you for your contributions to this free encyclopedia. If you decide that you need help, check out Getting Help below, ask me on my talk page, or place {{Help me}} on your talk page and ask your question there. Please remember to sign your name on talk pages by using four tildes (~~~~) or by clicking if shown; this will automatically produce your username and the date. Also, please do your best to always fill in the edit summary field with your edits. Below are some useful links to facilitate your involvement. Happy editing! – Gogo Dodo (talk) 23:54, 29 December 2016 (UTC)[reply]
Hello, I'm Gogo Dodo. I noticed that you made a change to an article, Soviet submarine K-129 (1960), but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. -- Gogo Dodo (talk) 23:55, 29 December 2016 (UTC)