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+# External Modules
+
+This directory contains external modules that are used by the WebGPU
+CTS. These are included in the repo, as opposed to being fetched via a
+package manager or CDN, so that there is a single canonical source of
+truth for the CTS tests and the CTS tests can be run as a standalone
+suite without needing to pull from a CDN or similar process.
+
+## Adding modules
+
+Each module that is added should be done consciously with a clear
+reasoning on what the module is providing, since the bar for adding
+new modules should be relatively high.
+
+The module will need to be licensed via a compatible license to the
+BSD-3 clause & W3C CTS licenses that the CTS currently is covered by.
+
+It is preferred to use a single source build of the module if possible.
+
+In addition to the source for the module a LICENSE file should be
+included in the directory clearly identifying the owner of the module
+and the license it is covered by.
+
+Details of the specific module, including version, origin and purpose
+should be listed below.
+
+## Current Modules
+
+| **Name**             | **Origin**                                       | **License** | **Version** | **Purpose**                                    |
+|----------------------|--------------------------------------------------|-------------|-------------|------------------------------------------------|
+| petamoriken/float16  | [github](https://github.com/petamoriken/float16) | MIT         | 3.6.6       | Fluent support for f16 numbers via TypedArrays |