diff --git a/include/tenok/sys/limits.h b/include/tenok/sys/limits.h
index 83d0b0f4..46aa8d0b 100644
--- a/include/tenok/sys/limits.h
+++ b/include/tenok/sys/limits.h
@@ -1,3 +1,6 @@
+/**
+ * @file
+ */
 #ifndef __LIMITS_H__
 #define __LIMITS_H__