diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 99abebfb..75fa762d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -29,6 +29,11 @@ Sometimes there's something that Rojo doesn't do that it probably should.
 
 Please file issues and we'll try to help figure out what the best way forward is.
 
+## Local Development Gotchas
+
+If your build fails with "Error: failed to open file `D:\code\rojo\plugin\modules\roact\src`" you need to update your Git submodules.
+Run the command and try building again: `git submodule update --init --recursive`.
+
 ## Pushing a Rojo Release
 The Rojo release process is pretty manual right now. If you need to do it, here's how:
 
@@ -51,4 +56,4 @@ The Rojo release process is pretty manual right now. If you need to do it, here'
     * Update the leading text with a summary about the release
     * Paste the changelog notes (as-is!) from [`CHANGELOG.md`](CHANGELOG.md)
     * Write a small summary of each major feature
-    * Attach release artifacts from GitHub Actions for each platform
\ No newline at end of file
+    * Attach release artifacts from GitHub Actions for each platform