diff --git a/src/Exception/SessionNotInitializedException.php b/src/Exception/SessionNotInitializedException.php
index c37e7a2..ce24f3c 100644
--- a/src/Exception/SessionNotInitializedException.php
+++ b/src/Exception/SessionNotInitializedException.php
@@ -16,7 +16,7 @@ public static function forMissingRequestAttribute(): self
         return new self(
             sprintf(
                 'A session has not been initialized. Ensure that you pipe the %s middleware prior to'
-                . 'attempting to retrieve or use a session instance',
+                . ' attempting to retrieve or use a session instance.',
                 SessionMiddleware::class
             )
         );