diff --git a/doc/authenticator.md b/doc/authenticator.md
index 1b9c154..f89d647 100644
--- a/doc/authenticator.md
+++ b/doc/authenticator.md
@@ -19,7 +19,7 @@
   ...
 ```
 
-Authenticators provides a method to add guard to actions in the controller:
+Authenticators provide a method to add guard to actions in the controller:
 
 - `ReadableUsersAuthenticator` provides `readableUsersOnly` method
 - `ReferrerAuthenticator` provides `referrersOnly` method