diff --git a/docs/usage.md b/docs/usage.md
index c6820767a..c40019a11 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -53,7 +53,7 @@ $(function() {
Specifies a RegExp or String containing a regular expression that the current search filter must match to be allowed to be created. May also be a predicate function that takes the filter text and returns whether it is allowed. |
mixed |
- false |
+ null |
highlight |