Update README.md

README.md

@@ -157,7 +157,7 @@ keychain.clear()
 
 ### Setting key prefix
 
-One can pass a `keyPrefix` argument when initializing a `KeychainSwift` object. The string passed in `keyPrefix` argument will be used as a prefix to **all the keys** used in `set`, `get`, `getData` and `delete` methods. The prefixed keychain can be useful in unit tests. This prevents the tests from changing the Keychain keys that are used when the app is launched manually.
+One can pass a `keyPrefix` argument when initializing a `KeychainSwift` object. The string passed in `keyPrefix` argument will be used as a prefix to **all the keys** used in `set`, `get`, `getData` and `delete` methods. Adding a prefix to the keychain keys can be useful in unit tests. This prevents the tests from changing the Keychain keys that are used when the app is launched manually.
 
 Note that `clear` method still clears everything from the Keychain regardless of the prefix used.