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 **Internals**
 
-* [How Testing Works](docs/testing.md)
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+* [How Testing Works](docs/testing.md)
+* [Continuous Integration Notes](docs/ci.md)
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diff --git a/docs/ci.md b/docs/ci.md
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+Continuous Integration Notes
+----------------------------
+
+Docker containers are registered in the registry that contain an environment for various PHP versions. At the very least
+there should be two versions, one of the oldest version of PHP we're supporting and one for the newest. In a perfect world,
+we'd also have an image for a Windows server using PHP to gain some CI test coverage with Windows style absolute paths.
+However, getting PHP running on a Windows container proved to be too complicated for the value. Until such a time where 
+we can get one created (contributions welcome), testing on Windows will be done manually.
+
+The Dockerfiles used to create these images are contained in a different repository: 
+[ClassFinderTestContainers](https://gitlab.com/hpierce1102/ClassFinderTestContainers).
+
+The CI scripts themselves are stored here in `/ci/*`, with the config in `/gitlab-ci.yml`.
+