diff --git a/README.md b/README.md
index 0d510980..ab261dea 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@
 
 ### 🛠️ Environment configuration
 
-1. Create a local environment file (`cp .env .env.local`) if you want to modify any parameter
+1. Create a local environment file (`cp .env .env.local`) if you want to modify any parameter.
 
 ### 🔥 Application execution
 
diff --git a/src/Mooc/CoursesCounter/Domain/CoursesCounterNotExist.php b/src/Mooc/CoursesCounter/Domain/CoursesCounterNotExist.php
index 5650c926..4046d8e2 100644
--- a/src/Mooc/CoursesCounter/Domain/CoursesCounterNotExist.php
+++ b/src/Mooc/CoursesCounter/Domain/CoursesCounterNotExist.php
@@ -10,6 +10,6 @@ final class CoursesCounterNotExist extends RuntimeException
 {
     public function __construct()
     {
-        parent::__construct('The courses counter not exist');
+        parent::__construct('The courses counter does not exist');
     }
 }