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diff --git a/src/tree_sitter/unicode/README.md b/src/tree_sitter/unicode/README.md
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+# ICU Parts
+
+This directory contains a small subset of files from the Unicode organization's [ICU repository](https://github.com/unicode-org/icu).
+
+### License
+
+The license for these files is contained in the `LICENSE` file within this directory.
+
+### Contents
+
+* Source files taken from the [`icu4c/source/common/unicode`](https://github.com/unicode-org/icu/tree/552b01f61127d30d6589aa4bf99468224979b661/icu4c/source/common/unicode) directory:
+  * `utf8.h`
+  * `utf16.h`
+  * `umachine.h`
+* Empty source files that are referenced by the above source files, but whose original contents in `libicu` are not needed:
+  * `ptypes.h`
+  * `urename.h`
+  * `utf.h`
+* `ICU_SHA` - File containing the Git SHA of the commit in the `icu` repository from which the files were obtained.
+* `LICENSE` - The license file from the [`icu4c`](https://github.com/unicode-org/icu/tree/552b01f61127d30d6589aa4bf99468224979b661/icu4c) directory of the `icu` repository.
+* `README.md` - This text file.
+
+### Updating ICU
+
+To incorporate changes from the upstream `icu` repository:
+
+* Update `ICU_SHA` with the new Git SHA.
+* Update `LICENSE` with the license text from the directory mentioned above.
+* Update `utf8.h`, `utf16.h`, and `umachine.h` with their new contents in the `icu` repository.