diff --git a/tests/ci/ci_config.py b/tests/ci/ci_config.py
index 1ca4e06bc8c..45bdfbecb0c 100644
--- a/tests/ci/ci_config.py
+++ b/tests/ci/ci_config.py
@@ -55,6 +55,13 @@ class JobConfig:
     run_always: bool = False
 
 
+# About the "sparse_checkout" option:
+#
+# Misha f. Shiryaev
+# :facepalm:
+# we have this feature, it's used by devs, we need to test it in CI
+# It's not useful for the CI itself
+
 @dataclass
 class BuildConfig:
     name: str