diff --git a/bench/bench.go b/bench/bench.go
index a16fd41..ebcfb9a 100644
--- a/bench/bench.go
+++ b/bench/bench.go
@@ -12,6 +12,9 @@ const (
 	// Neighbourhood is the number of neighbouring values that are to be
 	// generated as part of e.g. Stochastic Hill Climbing algo.
 	Neighbourhood = 10
+	// MaxNeighbourVariancePercent covers an arbitrary task requirement: pick
+	// neighbours from max n percent of search space.
+	MaxNeighbourVariancePercent = 10
 	// MaxFES is the maximum number of allowed function evaluations.
 	MaxFES = 10000
 )