diff --git a/doc/clocks.md b/doc/clocks.md
index cab77a180..098315fc6 100644
--- a/doc/clocks.md
+++ b/doc/clocks.md
@@ -76,11 +76,12 @@ Current usages:
 
 * `void SpinDelayUs(int us)`
 * `void SpinDelay(int ms)` based on SpinDelayUs
+* `void SpinDelayUsPrecision(int us)`
 
-Busy wait based on 46.875 kHz PWM Channel 0, 21.3 us precision
-
-WARNING: timer can't measure more than 1.39 s
+Busy wait based on 46.875 kHz PWM Channel 0
 
+* 21.3 us precision and maximum 1.39 s
+* *Precision* variant: 0.7 us precision and maximum 43 ms
 
 ## Occasional TC0+TC1 / CountUS functions