diff --git a/internal/experimentconfig/experimentconfig.go b/internal/experimentconfig/experimentconfig.go
index a2e321381..617429100 100644
--- a/internal/experimentconfig/experimentconfig.go
+++ b/internal/experimentconfig/experimentconfig.go
@@ -24,6 +24,9 @@ import (
 // value will be a zero-length list (either nil or empty).
 func DefaultOptionsSerializer(config any) (options []string) {
 	// as documented, this method MUST be passed a struct pointer
+	//
+	// Implementation note: the .Elem method converts a nil
+	// pointer to a zero value pointee type.
 	stval := reflect.ValueOf(config)
 	if stval.Kind() != reflect.Pointer {
 		return