diff --git a/UNIT_ADC.md b/UNIT_ADC.md
index 955ca65..a797b9c 100644
--- a/UNIT_ADC.md
+++ b/UNIT_ADC.md
@@ -74,7 +74,8 @@ Get numbers of all enabled channels.
 Get the current sample rate in Hz
 
 *Response:*
-- u32 - sample rate
+- u32 - sample rate as requested
+- float - real sample rate (some frequencies may not be achieved exactly due to hardware limitations)
 
 ### SETUP_TRIGGER (20)
 Configure the trigger level and other parameters.