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+# Projections
+
+Projections are a way to define relations between files. Every file can have a
+"related" or "alternate" file. It's common to consider spec files to be
+"alternate" files to source files.
+
+## How to use it
+
+- Install an editor plugin that consumes projections
+- Copy `.projections.json.example` to `.projections.json`
+
+## How to customize it
+
+You can find a basic list of projection options in
+[projectionist.txt](https://github.com/tpope/vim-projectionist/blob/master/doc/projectionist.txt)
+
+## Which plugins can I use
+
+- vim
+  - [vim-projectionist](https://github.com/tpope/vim-projectionist)
+- VSCode
+  - [Alternate File](https://marketplace.visualstudio.com/items?itemName=will-wow.vscode-alternate-file)
+  - [projectionist](https://github.com/jarsen/projectionist)
+  - [jumpto](https://github.com/gmdayley/jumpto)
+- Atom
+  - [projectionist-atom](https://atom.io/packages/projectionist-atom)
+- Command-line
+  - [projectionist](https://github.com/glittershark/projectionist)
+
+## History
+
+This started as a
+[plugin for vim by tpope](https://github.com/tpope/vim-projectionist)
+It has since become editor-agnostic and ported to most modern editors.