diff --git a/bench/cec2020/benchFunctions.go b/bench/cec2020/benchFunctions.go
index b5cf890..4c45833 100644
--- a/bench/cec2020/benchFunctions.go
+++ b/bench/cec2020/benchFunctions.go
@@ -28,3 +28,34 @@ package cec2020
 // void zakharov_func(double *, double *, int , double *,double *, int, int); // ZAKHAROV
 // void levy_func(double *, double *, int , double *,double *, int, int); // Levy
 // void dixon_price_func(double *, double *, int , double *,double *, int, int); // Dixon and Price
+
+// BentCigar is the "Bent Cigar Function" of CEC2020.
+func BentCigar(x []float64) float64 { return 0 }
+
+// Schwefel is the "Shifted and Rotated Schwefel's Function" of CEC2020.
+func Schwefel(x []float64) float64 { return 0 }
+
+// LunacekBiRastrigin is the "Shifted and Rotated Lunacek bi-Rastrigin Function" of CEC2020.
+func LunacekBiRastrigin(x []float64) float64 { return 0 }
+
+// RosenbrockGriewank is the "Expanded Rosenbrock's plus Griewank's Function"
+// of CEC2020.
+func RosenbrockGriewank(x float64) float64 { return 0 }
+
+// Hybrid1 is the "Hybrid Function 1" of CEC2020.
+func Hybrid1(x []float64) float64 { return 0 }
+
+// Hybrid2 is the "Hybrid Function 2" of CEC2020.
+func Hybrid2(x []float64) float64 { return 0 }
+
+// Hybrid3 is the "Hybrid Function 3" of CEC2020.
+func Hybrid3(x []float64) float64 { return 0 }
+
+// Composition1 is the "Composition Function 1" of CEC2020.
+func Composition1(x []float64) float64 { return 0 }
+
+// Composition2 is the "Composition Function 2" of CEC2020.
+func Composition2(x []float64) float64 { return 0 }
+
+// Composition3 is the "Composition Function 3" of CEC2020.
+func Composition3(x []float64) float64 { return 0 }