diff --git a/README.md b/README.md
index b247d44..beab358 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,7 @@
 pyhackrf-ctypes
 ==============
 pyhackrf-ctypes is a Python wrapper for libhackrf.<br>
-I create this project because  I want a simple Python interface to my hackrf board.
-At First I use pyusb to directly get the data from HackRF,  then I found pyusb can only move data at a  rate of  5MiB/S, too slow for HackRF.So I choose to use ctypes .
+I create this project because  I want a simple Python interface to my hackrf board and pyusb is too slow for hackrf.
 
 # Dependencies