diff --git a/artiq/sinara.page b/artiq/sinara.page
index 8eff569..fa02eb3 100644
--- a/artiq/sinara.page
+++ b/artiq/sinara.page
@@ -100,6 +100,8 @@ Interfaces include:
 
 <p><center><img src="sampler.jpg" width="600"></center></p>
 
+<p>Note that update rate specification on this page is for the hardware only; ARTIQ kernel and RTIO overhead make the effective sample rate lower. Typically, only with gateware (e.g. SU-Servo) can the maximum bandwidth be achieved. SU-Servo is part of the regular ARTIQ firmware; development of other gateware can be purchased separately.</p>
+
 <h2>Grabber camera interface</h2>
 <p>Grabber allows the connection of certain scientific (EM)CCD cameras port to the core FPGA. Those cameras have a Camera Link interface.</p>