diff --git a/benchmarks/README.md b/benchmarks/README.md
index 79c1d0e..8d76ed0 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -99,7 +99,7 @@ over-build and blocked tasks, can cost more on large completion-forced agentic r
 
 ### Prerequisites
 
-Running the benchmark requires **Python 3**, **pandas**, and **Node.js** (18+).
+Running the benchmark requires **Python 3**, **pandas**, and **Node.js ≥ 22.22.0** (promptfoo's engine constraint; see [Reproduce](#reproduce)).
 
 ## Notes