diff --git a/README.md b/README.md
index 005e7ae..e759218 100644
--- a/README.md
+++ b/README.md
@@ -1,15 +1,22 @@
 # SimpleNeuralNetwork
 This is a C++ implement of simple neural network. It's based on video [Neural Net in C++ Tutorial](https://vimeo.com/19569529) by David Miller.
 # Test in Ubuntu
-1 Gernerate training data to slove XOR problem
+1 Generate training data to slove XOR problem
 ```
     g++ ./makeTrainingSamples.cpp -o makeTrainingSamples
-    ./makeTrainingSamples > out.txt
+    ./makeTrainingSamples > trainingData.
 ```
-2 Test neural netwrok
+2 Test neural network
 ```
     g++ ./neural-net.cpp -o neural-net
     ./neural-net
 ```
 And you will get the result!
-
+# Tuning your neural network 
+3 Using different topology 
+```
+     In the trainingdata.txt, the default topology is 2 4 1.
+     Changing to a different topology gives different results for same datasets.
+     For example changing to 2 4 2 1 gives almost 30 percent more
+     accurate model  for 4000 samples of data sets compared to previous one.
+```