diff --git a/contrib/libc-headers/README.md b/contrib/libc-headers/README.md
new file mode 100644
index 00000000000..612a315b975
--- /dev/null
+++ b/contrib/libc-headers/README.md
@@ -0,0 +1,14 @@
+## How it was created?
+
+```
+ninja -t deps | grep -P '^    /' | sort | uniq | grep '/usr/include/' | grep -vF 'c++' | grep -vP 'llvm|unicode|readline|hs' | sed 's/    \/usr\/include\///' | xargs -I{} cp -r /usr/include/{} ~/ClickHouse/contrib/libc-headers/{}
+```
+
+```
+$ ldd --version
+ldd (Ubuntu GLIBC 2.27-3ubuntu1) 2.27
+```
+
+## Why do we need this?
+
+These files are needed for more consistent builds.