diff --git a/README.md b/README.md
index 805663b..97a94b2 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,10 @@
-# Principles-of-Data-Science_forPython3
\ No newline at end of file
+# Principles-of-Data-Science_forPython3
+
+The original python script is for the python2.7, most of them can not be used for python3.
+So when studying the book I am trying to make some new script based on python3..
+nearly all code are key in but not copy in... this is also a self-study record..
+if anyone think this helps, tell me and glad to know that..
+
+Whatever the most effective method for learning something is to build it by yourself, rather than copying. 
+
+All python script are named by something like PXX_XXX, P refer to pages of the book--note the Chinese version of the book!!