Update README.md

README.md

@@ -227,7 +227,9 @@ var_export($entry);
 ```
 
 Under the covers, the searching system uses [preg_match](http://php.net/manual/en/function.preg-match.php), with the
-following structure: ` '{%s}Si' ` with %s being replaced by your input.
+following structure: ` '{%s}Si' ` by default, with %s being replaced by your input.
+
+If you wish for a case-sensitive search, pass in `true` as the 2nd parameter when executing `search()`.
 
 ## Sorting
 
@@ -244,4 +246,4 @@ For the moment this library serves my needs, however if anybody using this libra
 improvements / modifications made, please let me know!
 
 ## Tests
-...should probably do that.
+...should probably do that.