diff --git a/Spec_test.go b/Spec_test.go
index 91f5682..2146f69 100644
--- a/Spec_test.go
+++ b/Spec_test.go
@@ -1569,7 +1569,7 @@ func TestRunSuite_spectAsSuite(t *testing.T) {
 	suite2.Test("tst2", func(t *testcase.T) { name2 = t.Name() })
 
 	dtb := &doubles.TB{}
-	testcase.RunSuite(dtb, suite1, suite2.AsSuite())
+	testcase.RunSuite[testcase.Suite](dtb, suite1, suite2.AsSuite())
 
 	assert.True(t, strings.HasSuffix(name1, "tst1"))
 	assert.True(t, strings.HasSuffix(name2, "tst2"))
diff --git a/Suite.go b/Suite.go
index 9322766..8e3023d 100644
--- a/Suite.go
+++ b/Suite.go
@@ -33,7 +33,7 @@ type OpenSuite interface {
 // RunSuite is a helper function that makes execution one or many Suite easy.
 // By using RunSuite, you don't have to distinguish between testing or benchmark execution mod.
 // It supports *testing.T, *testing.B, *testcase.T, *testcase.Spec and CustomTB test runners.
-func RunSuite[TBS anyTBOrSpec](tb TBS, contracts ...Suite) {
+func RunSuite[S Suite, TBS anyTBOrSpec](tb TBS, contracts ...S) {
 	if tb, ok := any(tb).(helper); ok {
 		tb.Helper()
 	}
@@ -46,7 +46,7 @@ func RunSuite[TBS anyTBOrSpec](tb TBS, contracts ...Suite) {
 	}
 }
 
-func RunOpenSuite[TBS anyTBOrSpec](tb TBS, contracts ...OpenSuite) {
+func RunOpenSuite[OS OpenSuite, TBS anyTBOrSpec](tb TBS, contracts ...OS) {
 	if tb, ok := any(tb).(helper); ok {
 		tb.Helper()
 	}
diff --git a/Suite_test.go b/Suite_test.go
index 6021ab3..cfe4414 100644
--- a/Suite_test.go
+++ b/Suite_test.go
@@ -199,3 +199,22 @@ func TestSpec_AsSuite_merge(t *testing.T) {
 
 	// TODO: cover further
 }
+
+type SampleContractType interface {
+	testcase.Suite
+	testcase.OpenSuite
+}
+
+func SampleContracts() []SampleContractType {
+	return []SampleContractType{}
+}
+
+func ExampleRunSuite() {
+	s := testcase.NewSpec(nil)
+	testcase.RunSuite(s, SampleContracts()...)
+}
+
+func ExampleRunOpenSuite() {
+	s := testcase.NewSpec(nil)
+	testcase.RunOpenSuite(s, SampleContracts()...)
+}