diff --git a/libcxx/docs/TestingLibcxx.rst b/libcxx/docs/TestingLibcxx.rst
--- a/libcxx/docs/TestingLibcxx.rst
+++ b/libcxx/docs/TestingLibcxx.rst
@@ -101,6 +101,27 @@
 - clang-query
 - clang-tidy
 
+Enabling clang-tidy checks
+--------------------------
+
+We have libc++-specific clang-tidy checks, which have to be compiled before running
+clang-tidy. Because of that, there are some additional requirements other than just
+having a recent clang-tidy version installed on the system.
+
+To compile clang-tidy checks, `-DLIBCXX_ENABLE_CLANG_TIDY=On` has to be passed to the
+CMake invocation used to compile libc++. For the CMake invocation and compiling libc++
+to succeed, the clang-tidy headers and binaries have to be available on the system.
+Here is an overview, which packages are required on a given system:
+
+============ ================================
+platform     required packages
+============ ================================
+Debian-based clang-tidy llvm-dev libclang-dev
+============ ================================
+
+With the listed packages installed, the clang-tidy checks should compile and the
+clang-tidy checks will get executed when running the libc++ tests.
+
 Writing Tests
 -------------