Update README.md

Author: chenxinye

README.md

@@ -133,7 +133,7 @@ print(X_q[:10, 0])
 
 If one is not seeking optimized performance and more emulation supports, one can use the following example. 
 
-``pychop`` also provides same functionalities just like Higham's chop [1], but with relatively faster rounding:
+``pychop`` also provides same functionalities just like Higham's chop [1] that supports soft error simulation (by setting ``flip=True``), but with relatively faster speed:
 
 ```Python
 from pychop import Chop
@@ -355,5 +355,6 @@ If you use ``pychop`` in your research or simulations, cite:
 
 
 
+