diff --git a/examples/test13.cpp b/examples/test13.cpp
index 7bfa5a4..12fa8bc 100644
--- a/examples/test13.cpp
+++ b/examples/test13.cpp
@@ -16,6 +16,8 @@ using namespace TCLAP;
 //
 // This should not print an error
 //
+// Contributed by Nico Lugil.
+//
 int main()
 {