diff --git a/.github/scripts/check-whitespace.py b/.github/scripts/check-whitespace.py
index bf06d03bcc..45ffc0b975 100644
--- a/.github/scripts/check-whitespace.py
+++ b/.github/scripts/check-whitespace.py
@@ -302,6 +302,7 @@ def existing_path(value: str) -> Path:
 
 
 # Python files are covered by `black`.
+# Rust files (*.rs) are covered by `cargo fmt`.
 PATTERNS = (
     "*.cpp",
     "*.h",