diff --git a/neuralNetwork.h b/neuralNetwork.h
index 7f06607..78a6102 100644
--- a/neuralNetwork.h
+++ b/neuralNetwork.h
@@ -1,6 +1,8 @@
 #ifndef NEURALNETWORK_H
 #define NEURALNETWORK_H
 
+#define FILE_HEADER_STRING "__info2_neural_network_file_format__"
+
 #include "imageInput.h"
 #include "matrix.h"