diff --git a/README.md b/README.md
index 4484030b..e286380b 100644
--- a/README.md
+++ b/README.md
@@ -123,6 +123,7 @@ The parsing engine currently supports the following rules:
 line'}
 ```
 - inner quotes are maintained (think JSON) (`JSON={"foo": "bar"}` becomes `{JSON:"{\"foo\": \"bar\"}"`)
+- whitespace is removed from both ends of the value (see more on [`trim`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim)) (`FOO="  some value  "` becomes `{FOO: 'some value'}`)
 
 ## FAQ