diff --git a/README.md b/README.md
index c452e50..77d41b1 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,7 @@ Truthy values are `true` and all numbers other than 0. It is an error to attempt
 a = 0
 while a < 10
     print a // prints 0 1 2 3 4 5 6 7 8 9, each on a newline
-    a = a + 1
+    a += 1
 wend
 ```