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-rw-r--r--src/librtc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/librtc.c b/src/librtc.c
index 5ed3b4fc7..8d748b06e 100644
--- a/src/librtc.c
+++ b/src/librtc.c
@@ -1,3 +1,7 @@
+// Ruby/Sapphire/Emerald cartridges contain a Seiko Instruments Inc. (SII)
+// S-3511A real-time clock (RTC). This library ("SIIRTC_V001") is for
+// communicating with the RTC.
+
#include "gba/gba.h"
#include "rtc.h"