diff --git a/bench/bench.go b/bench/bench.go
index a428c65..122eed5 100644
--- a/bench/bench.go
+++ b/bench/bench.go
@@ -3,8 +3,6 @@
 
 package bench
 
-import "math"
-
 type funcParams struct {
 	min float64
 	max float64
@@ -34,36 +32,3 @@ func (*funcParams) Min(self *funcParams) float64 {
 func (*funcParams) Max(self *funcParams) float64 {
 	return self.max
 }
-
-// Schwefel computes a value of the Schwefel function for x.
-func Schwefel(x []float64) float64 {
-	var res float64
-
-	for _, val := range x {
-		res += val * math.Sin(math.Sqrt(math.Abs(val)))
-	}
-
-	return 418.9829*float64(len(x)) - res
-}
-
-// DeJong1st computes the value of the 1st De Jong function for x.
-func DeJong1st(x []float64) float64 {
-	var res float64
-
-	for _, val := range x {
-		res += math.Floor(val)
-	}
-
-	return res
-}
-
-// DeJong2nd computes the value of the 2nd De Jong function for x.
-func DeJong2nd(x []float64) float64 {
-	var res float64
-
-	for _, val := range x {
-		res += math.Pow(val, 2)
-	}
-
-	return res
-}
diff --git a/bench/functions.go b/bench/functions.go
new file mode 100644
index 0000000..1638132
--- /dev/null
+++ b/bench/functions.go
@@ -0,0 +1,39 @@
+// Copyright 2022 wanderer <a_mirre at utb dot cz>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package bench
+
+import "math"
+
+// Schwefel computes a value of the Schwefel function for x.
+func Schwefel(x []float64) float64 {
+	var res float64
+
+	for _, val := range x {
+		res += val * math.Sin(math.Sqrt(math.Abs(val)))
+	}
+
+	return 418.9829*float64(len(x)) - res
+}
+
+// DeJong1st computes the value of the 1st De Jong function for x.
+func DeJong1st(x []float64) float64 {
+	var res float64
+
+	for _, val := range x {
+		res += math.Floor(val)
+	}
+
+	return res
+}
+
+// DeJong2nd computes the value of the 2nd De Jong function for x.
+func DeJong2nd(x []float64) float64 {
+	var res float64
+
+	for _, val := range x {
+		res += math.Pow(val, 2)
+	}
+
+	return res
+}