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+# darling-icu
+
+## Upstream URL
+
+https://github.com/apple-oss-distributions/ICU/tree/ICU-66112
+
+## Updating Source
+
+When updating the source code, make sure to refer to the [`Updating Sources`](https://docs.darlinghq.org/contributing/updating-sources/index.html#updating-sources) section from the Darling Docs website. Additional details (if any) can be found in [`darling/notes/UPDATE_SOURCE.md`](darling/notes/UPDATE_SOURCE.md).
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diff --git a/darling/notes/UPDATE_SOURCE.md b/darling/notes/UPDATE_SOURCE.md
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+# Notes
+
+* When updating `icu`, you will need to generate the `icudtXXl.dat` file. The `build_icusources.sh` script will handle generating the file. After that make sure to run the following commands:
+
+```bash
+cp $ICU_ROOT/tmp/build/data/out/icudt64l.dat $ICU_ROOT/icuSources/data/out/icudt64l.dat
+xz -z $ICU_ROOT/icuSources/data/out/icudt64l.dat
+```