diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000..9635257ec
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "submodules/RSCore"]
+	path = submodules/RSCore
+	url = https://github.com/brentsimmons/RSCore
diff --git a/Technotes/SubmoduleCheatSheet.md b/Technotes/SubmoduleCheatSheet.md
new file mode 100644
index 000000000..2615a7c6f
--- /dev/null
+++ b/Technotes/SubmoduleCheatSheet.md
@@ -0,0 +1,8 @@
+# Git Submodules
+
+Evergreen uses [Git submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules) to include shared frameworks. At this writing (June 2018) they are DB5, RSCore, RSWeb, RSTree, and RSParser.
+
+To add a submodule:
+
+	git submodule add https://github.com/username/path
+
diff --git a/submodules/RSCore b/submodules/RSCore
new file mode 160000
index 000000000..43e3f0a07
--- /dev/null
+++ b/submodules/RSCore
@@ -0,0 +1 @@
+Subproject commit 43e3f0a07aed5d3ffa3bec341625e3d743d3f568