diff --git a/task09/README.md b/task09/README.md
index b45bcd9..5c8ef26 100644
--- a/task09/README.md
+++ b/task09/README.md
@@ -83,12 +83,14 @@ The program will output `out.png`. Rename it to `out_default.png` then it replac
 
 ![problem1](out_default.png)
 
+This code only move the position of fixed vertex. Let's deform other vertices to make hte deformation smooth!
+
 
 ## Problem 2 (smooth deformation with Laplacian)
 
 Write a few lines of code around line #134 to implement smooth mesh deformation using Laplacian. 
 
-The program will output `output.png`. Rename it to `out_laplacian.png` then it replaces the image below.
+The program will output `out.png`. Rename it to `out_laplacian.png` then it replaces the image below.
 
 ![problem1](out_laplacian.png)
  
diff --git a/task09/main.py b/task09/main.py
index 63702b8..57cfc02 100644
--- a/task09/main.py
+++ b/task09/main.py
@@ -199,7 +199,7 @@ def render(self, time, frame_time):
             if rgb.shape[0] == 1000:
                 rgb = rgb[::2, ::2, :].copy('C')
             rgb = Image.fromarray(rgb)
-            ImageOps.flip(rgb).save("output.png")
+            ImageOps.flip(rgb).save("out.png")
 
 
 def main():