diff --git a/README.md b/README.md
index 9c83be98c36ce1c4319ff61cfa7f27536988f3ec..d99536a4c350ccedad44744983116c7ef771b29b 100644
--- a/README.md
+++ b/README.md
@@ -12,5 +12,6 @@ References and Resources:
 and [Video of Cloning a Git Repository Using NetBeans IDE](https://netbeans.org/kb/docs/ide/git_nb_ssh_screencast.html)
 * [Open-DIS Repository](https://github.com/open-dis) and [Distributed Interactive Simulation: The Missing Handbook](https://github.com/open-dis/DISTutorial/blob/master/README.md)
 * [Savage Developers Guide](https://savage.nps.edu/Savage/developers.html) resources for [DIS](https://savage.nps.edu/Savage/developers.html#DIS)
+* UML [Sequence diagram](https://en.wikipedia.org/wiki/Sequence_diagram) on Wikipedia
 * [WireShark](https://wireshark.org) and [WireShark Tutorial for Beginners](https://www.youtube.com/watch?v=TkCSr30UojM) video by Anson Alexander
 * [X3D-Edit](https://savage.nps.edu/X3D-Edit/#Downloads) as Netbeans Plugin