Add note on illegal global variable names

1 files changed, 9 insertions, 0 deletions

diff --git a/README.md b/README.md
index c0571eb..e02bfc5 100644
--- a/README.md
+++ b/README.md
@@ -151,6 +151,15 @@ Be careful, if you do something like this you'll change your global console inst
 myModule.__set__("console.log", function () { /* be quiet */ });
 ```
 
+**Globals with invalid variable names**<br>
+rewire imports global variables into the local scope by prepending a list of `var` declarations:
+
+```javascript
+var someGlobalVar = global.someGlobalVar;
+```
+
+If `someGlobalVar` is not a valid variable name, rewire just ignores it. **In this case you're not able to override the global variable locally**. 
+
 <br />
 
 API