diff --git a/GB_set_rtc_mode.md b/GB_set_rtc_mode.md
index 6b3e9f0..c99768a 100644
--- a/GB_set_rtc_mode.md
+++ b/GB_set_rtc_mode.md
@@ -7,14 +7,21 @@ typedef enum {
 } GB_rtc_mode_t;
 ```
 
-<tt>void GB_set_rtc_mode([[GB_gameboy_t]] *gb, [[GB_rtc_mode_t]] mode);</tt>
+<tt>void GB_set_rtc_mode([[GB_gameboy_t]] *gb, GB_rtc_mode_t mode);</tt>
 
 In `timing.h`
 
 ## Description
 
-TBD
+Specifies how the emulator instances emulates a Real Time Clock inside an emulated cartridge:
+
+* `GB_RTC_MODE_SYNC_TO_HOST`: The RTC follows the time in the host's clock. Even when the emulator instance is [[overclocked, underclocked|GB_set_clock_multiplier]], set to [[turbo mode|GB_set_turbo_mode]], or paused, the in-game RTC will always advanced in one real-world-second intervals.
+* `GB_RTC_MODE_ACCURATE`: The RTC timings are accurately emulated. Pausing or changing the speed of the instance will also pause or change the speed of the RTC.
 
 ## Thread Safety
 
 `GB_set_rtc_mode` is thread-safe and can be called from any thread and context.
+
+## See Also
+
+* [[GB_set_rtc_multiplier]]
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