diff --git a/config/config.go b/config/config.go
index fbaf21ce4..4a663610f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -10,8 +10,8 @@ package config
 type TestStepConfigFunc func(TestStepConfigRequest) string
 
 // TestStepConfigRequest defines the request supplied to types
-// implementing TestStepConfigFunc. StepNumber is used in the
-// predefined helper functions:
+// implementing TestStepConfigFunc. StepNumber is one-based
+// and is used in the predefined helper functions:
 //
 //   - [config.TestStepDirectory]
 //   - [config.TestStepFile].
diff --git a/config/directory.go b/config/directory.go
index a7b90eeee..27237c60f 100644
--- a/config/directory.go
+++ b/config/directory.go
@@ -54,7 +54,8 @@ func TestNameDirectory() func(TestStepConfigRequest) string {
 //	}
 //
 // The testing configurations will be expected in the
-// testdata/TestExampleCloudThing_basic/1 directory.
+// testdata/TestExampleCloudThing_basic/1 directory as
+// TestStepConfigRequest.StepNumber is one-based.
 func TestStepDirectory() func(TestStepConfigRequest) string { //nolint:paralleltest //Not a test
 	return func(req TestStepConfigRequest) string {
 		return filepath.Join("testdata", req.TestName, strconv.Itoa(req.StepNumber))
diff --git a/config/file.go b/config/file.go
index c8fe8d5fa..0aa73383b 100644
--- a/config/file.go
+++ b/config/file.go
@@ -54,7 +54,8 @@ func TestNameFile(file string) func(TestStepConfigRequest) string {
 //	}
 //
 // The testing configuration will be expected in the
-// testdata/TestExampleCloudThing_basic/1/test.tf file.
+// testdata/TestExampleCloudThing_basic/1/test.tf file
+// as TestStepConfigRequest.StepNumber is one-based.
 func TestStepFile(file string) func(TestStepConfigRequest) string { //nolint:paralleltest //Not a test
 	return func(req TestStepConfigRequest) string {
 		return filepath.Join("testdata", req.TestName, strconv.Itoa(req.StepNumber), file)