diff --git a/README.md b/README.md
index 14a8b0d..d5f808f 100644
--- a/README.md
+++ b/README.md
@@ -37,5 +37,9 @@ The repl has the following syntax (It's work in progress, new capabilities will
   b = vector(-1, 1)
   c = "a+b"
   ```
-* and press enter. Then using the mouse pointer move a or b. 
+* and press enter. Then using the mouse pointer move a or b. Or try:
+  ```
+  a=2*a
+  ```
+  this updates vector ```a``` to twice it's size. And, because ```c``` is defined lazily, it is updated as well!
 * or type help()
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