diff --git a/src/app/main.c b/src/app/main.c
index 8477854..3ceb798 100644
--- a/src/app/main.c
+++ b/src/app/main.c
@@ -14,7 +14,7 @@ int main(void)
     printf
     (
         "Hi.\n"
-        "This is an simple application written using WHY2 Encryption System.\n\n"
+        "This is a simple application written using WHY2 Encryption System.\n\n"
 
         "\"%s\" => \"%s\"\n\n"