diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+Files under the src/Web/Static/documents/documentation/manual/ directory are generated in 
+the [wix3 repo][wix3], under the src/chm/ directory and from the [WiX XSD][wix.xsd].
+
+Do not edit the files directly; they will be overwritten from the wix3 build.
+
+
+[wix3]: https://github.com/wixtoolset/wix3
+[wix.xsd]: https://github.com/wixtoolset/wix3/blob/develop/src/tools/wix/Xsd/wix.xsd