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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ Use python3 to run `tool/build.py`. Run with `-h` to see the options.
 
 ## structure of repository
 
+- 'include/' contains public headers.
+
 - `src/` contains the main codes including headers and sources.
 
 - `tools/` contains some codes of tools like code generators.