Document how to update submodules

heroku · Dec 11, 2024 · 15a1829 · 15a1829
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -58,6 +58,12 @@ This project uses submodules, to clone all code run:
 $ git clone --recursive https://github.com/heroku/buildpacks-jvm
 ```
 
+When working on a branch you may need to run:
+
+```
+$ git submodule update --init --remote --recursive
+``
+
 ### Building
 
 1. Run `cargo check` to download dependencies and ensure there are no