diff --git a/Firewall/ContextListener.php b/Firewall/ContextListener.php
index 9193a5c5..9243119a 100644
--- a/Firewall/ContextListener.php
+++ b/Firewall/ContextListener.php
@@ -292,7 +292,7 @@ protected function refreshUser(TokenInterface $token)
             return null;
         }
 
-        throw new \RuntimeException(sprintf('There is no user provider for user "%s".', $userClass));
+        throw new \RuntimeException(sprintf('There is no user provider for user "%s". Shouldn\'t the "supportsClass()" method of your user provider return true for this classname?', $userClass));
     }
 
     private function safelyUnserialize(string $serializedToken)
diff --git a/RememberMe/AbstractRememberMeServices.php b/RememberMe/AbstractRememberMeServices.php
index 9c9e1c07..86919599 100644
--- a/RememberMe/AbstractRememberMeServices.php
+++ b/RememberMe/AbstractRememberMeServices.php
@@ -234,7 +234,7 @@ final protected function getUserProvider(string $class): UserProviderInterface
             }
         }
 
-        throw new UnsupportedUserException(sprintf('There is no user provider that supports class "%s".', $class));
+        throw new UnsupportedUserException(sprintf('There is no user provider for user "%s". Shouldn\'t the "supportsClass()" method of your user provider return true for this classname?', $class));
     }
 
     /**