diff --git a/book/en/src/by-example/tips_monotonic_impl.md b/book/en/src/by-example/tips_monotonic_impl.md
index 24df7712c5..38f3e92d8b 100644
--- a/book/en/src/by-example/tips_monotonic_impl.md
+++ b/book/en/src/by-example/tips_monotonic_impl.md
@@ -18,7 +18,8 @@ The trait documents the requirements for each method,
 and for inspiration here is a list of `Monotonic` implementations:
 
 - [`STM32F411 series`], implemented for the 32-bit timers
-- [`Nordic nRF52 series`], implemented for the 32-bit timers
+- [`Nordic nRF52 series Timer`], implemented for the 32-bit timers
+- [`Nordic nRF52 series RTC`], implemented for the RTCs
 - [`Systick based`], runs at a fixed rate - some overhead but simple
 - [`DWT and Systick based`], a more efficient `Systick` based implementation, but requires `DWT`
 
@@ -28,6 +29,7 @@ If you know of more implementations feel free to add them to this list.
 [`fugit`]: https://docs.rs/fugit/
 [`embedded_time`]: https://docs.rs/embedded_time/
 [`STM32F411 series`]: https://github.com/kalkyl/f411-rtic/blob/main/src/bin/mono.rs
-[`Nordic nRF52 series`]: https://github.com/kalkyl/nrf-play/blob/main/src/bin/mono.rs
+[`Nordic nRF52 series Timer`]: https://github.com/kalkyl/nrf-play/blob/main/src/bin/mono.rs
+[`Nordic nRF52 series RTC`]: https://gist.github.com/korken89/fe94a475726414dd1bce031c76adc3dd
 [`Systick based`]: https://github.com/rtic-rs/systick-monotonic
 [`DWT and Systick based`]: https://github.com/rtic-rs/dwt-systick-monotonic