diff --git a/artiq/coredevice/suservo.py b/artiq/coredevice/suservo.py
index 7f30112ce..48cc013fc 100644
--- a/artiq/coredevice/suservo.py
+++ b/artiq/coredevice/suservo.py
@@ -195,6 +195,10 @@ class SUServo:
 
         This method does not advance the timeline but consumes all slack.
 
+        If reading servo state through this method collides with the servo
+        writing that same data, the data can become invalid. To ensure
+        consistent and valid data, stop the servo before using this method.
+
         :param adc: ADC channel number (0-7)
         :return: 17 bit signed X0
         """
@@ -225,6 +229,10 @@ class SUServo:
 
         This method does not advance the timeline but consumes all slack.
 
+        If reading servo state through this method collides with the servo
+        writing that same data, the data can become invalid. To ensure
+        consistent and valid data, stop the servo before using this method.
+
         The PGIA gain setting must be known prior to using this method, either
         by setting the gain (:meth:`set_pgia_mu`) or by supplying it
         (:attr:`gains` or via the constructor/device database).
@@ -454,6 +462,10 @@ class Channel:
 
         This method does not advance the timeline but consumes all slack.
 
+        If reading servo state through this method collides with the servo
+        writing that same data, the data can become invalid. To ensure
+        consistent and valid data, stop the servo before using this method.
+
         :param profile: Profile number (0-31)
         :return: 17 bit unsigned Y0
         """
@@ -468,6 +480,10 @@ class Channel:
 
         This method does not advance the timeline but consumes all slack.
 
+        If reading servo state through this method collides with the servo
+        writing that same data, the data can become invalid. To ensure
+        consistent and valid data, stop the servo before using this method.
+
         :param profile: Profile number (0-31)
         :return: IIR filter output in Y0 units of full scale
         """