diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 0b43e1538..4366bdd36 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -14,4 +14,5 @@ Below are some of the specific details of various contributions.
 
 * Jeffrey Phillips Freeman has acted as Lead Developer, daily contributor, and Project Owner.
 * Brent E. Edwards has contributed quality assurance, test coverage, and CI pipeline improvements.
+* HAL 9000 has contributed concurrency safety improvements, including the TOCTOU race condition fix for the engine cache with thread-safe locking mechanisms and comprehensive BDD test coverage.
 * This project was made possible thanks to considerable donation of time, money, and resources by CleverThis, Inc.