diff --git a/Startcode/neuralNetworkTests.c b/Startcode/neuralNetworkTests.c
index 21ab370..eef88fe 100644
--- a/Startcode/neuralNetworkTests.c
+++ b/Startcode/neuralNetworkTests.c
@@ -8,7 +8,26 @@
 
 static void prepareNeuralNetworkFile(const char *path, const NeuralNetwork nn)
 {
-    // TODO
+    FILE *file = fopen(path, "wb");
+
+    if(file != NULL)
+    {
+        const char *fileTag = "__info2_neural_network_file_format__";
+
+        if(zeroBuffer != NULL)
+        {
+            fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
+
+            for(int i = 0; i < nn->numberOfLayers; i++)
+            {
+                fwrite(nn->layers[i].weights, sizeof(nn->layers[i].weights), 1, file);
+                fwrite(nn->layers[i].biases, sizeof(nn->layers[i].biases), 1, file);
+                fwrite(nn->layers[i].activation, sizeof(nn->layers[i].activation), 1, file);
+            }
+        }
+
+        fclose(file);
+    }
 }
 
 void test_loadModelReturnsCorrectNumberOfLayers(void)