diff --git a/ThirdParty/.clang-tidy b/ThirdParty/.clang-tidy
index 62160a2d11db62302537cb74504c6fe8d2e526f6..8cd40d73ca6ea2462431fdf3693c0d9ab781c430 100644
--- a/ThirdParty/.clang-tidy
+++ b/ThirdParty/.clang-tidy
@@ -1,3 +1,6 @@
 ---
-# Disable all checks, one check has to be enabled (hack)
+# Disable all checks, one check has to be enabled.
+# Hack: if there is no enabled check clang-tidy (at least in the way it is
+# invoked by CMake) prints out its own usage instructions. I have chosen an
+# arbitrary check here.
 Checks: '-*,boost-use-to-string'