diff --git a/README.md b/README.md
index 82420bd377..7dc7000b45 100644
--- a/README.md
+++ b/README.md
@@ -232,3 +232,7 @@ This project is licensed under either of
    http://opensource.org/licenses/MIT)
 
 at your option.
+
+The data in `regex-syntax/src/unicode_tables/` is licensed under the Unicode
+License Agreement
+([LICENSE-UNICODE](http://www.unicode.org/copyright.html#License).
diff --git a/regex-syntax/src/unicode_tables/LICENSE-UNICODE b/regex-syntax/src/unicode_tables/LICENSE-UNICODE
new file mode 100644
index 0000000000..b82826bdbd
--- /dev/null
+++ b/regex-syntax/src/unicode_tables/LICENSE-UNICODE
@@ -0,0 +1,57 @@
+UNICODE, INC. LICENSE AGREEMENT - DATA FILES AND SOFTWARE
+
+Unicode Data Files include all data files under the directories
+http://www.unicode.org/Public/, http://www.unicode.org/reports/,
+http://www.unicode.org/cldr/data/, http://source.icu-project.org/repos/icu/, and
+http://www.unicode.org/utility/trac/browser/.
+
+Unicode Data Files do not include PDF online code charts under the
+directory http://www.unicode.org/Public/.
+
+Software includes any source code published in the Unicode Standard
+or under the directories
+http://www.unicode.org/Public/, http://www.unicode.org/reports/,
+http://www.unicode.org/cldr/data/, http://source.icu-project.org/repos/icu/, and
+http://www.unicode.org/utility/trac/browser/.
+
+NOTICE TO USER: Carefully read the following legal agreement.
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+DATA FILES ("DATA FILES"), AND/OR SOFTWARE ("SOFTWARE"),
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+IF YOU DO NOT AGREE, DO NOT DOWNLOAD, INSTALL, COPY, DISTRIBUTE OR USE
+THE DATA FILES OR SOFTWARE.
+
+COPYRIGHT AND PERMISSION NOTICE
+
+Copyright © 1991-2018 Unicode, Inc. All rights reserved.
+Distributed under the Terms of Use in http://www.unicode.org/copyright.html.
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+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Unicode data files and any associated documentation
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