# 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, RSDatabase, RSWeb, RSTree, and RSParser.
To add a submodule:
git submodule add https://github.com/username/path
(It’s unlikely you’ll need to do that. Adding a submodule is done super-rarely, if ever, and it’s Brent’s call.)
To update all submodules to their latest commits:
git submodule foreach git pull origin master
