diff --git a/README.md b/README.md
index 656798a..9c00d38 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,6 @@
 # matrix
-Matrix screen saver.
+Full HD Matrix screen saver. Quit by pressing escape.
+```
+python main.py
+```
+![Preview](preview.png)
diff --git a/main.py b/main.py
index 513acdb..7ad1a82 100644
--- a/main.py
+++ b/main.py
@@ -19,12 +19,15 @@
 second_font = pygame.font.SysFont(None, SECOND_FONT_SIZE)
 clock = pygame.time.Clock()
 
-columns = [0 for _ in range(COLS_NUM)]
+columns = [0] * COLS_NUM
 while True:
     clock.tick(FPS)
     for event in pygame.event.get():
         if event.type == pygame.QUIT:
             quit()
+        if event.type == pygame.KEYDOWN:
+            if event.key == pygame.K_ESCAPE:
+                quit()
     for i, column in enumerate(columns):
         c = (0, 120 + random.randint(0, 120), 0)
         if random.random() < 0.01:
diff --git a/preview.png b/preview.png
new file mode 100644
index 0000000..9ce6a71
Binary files /dev/null and b/preview.png differ