From 0c0294d61b0bfc9b8445441ebbb4432774907e5d Mon Sep 17 00:00:00 2001
From: Johannes Ewald <johannes.ewald@peerigon.com>
Date: Sat, 17 Jan 2015 16:41:02 +0100
Subject: Add note on illegal global variable names

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

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
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