1 files changed, 1 insertions, 0 deletions

diff --git a/reg/port.h b/reg/port.h
index 704eaaf..23cf77f 100644
--- a/reg/port.h
+++ b/reg/port.h
@@ -1,3 +1,4 @@
+/* Port control and interrupts (PORT) (Chapter 11) */
 #ifndef MK20DX256_REG_PORT_H
 #define MK20DX256_REG_PORT_H