diff --git a/artiq/coredevice/spi2.py b/artiq/coredevice/spi2.py
index 1a788d88f..3a7eb6ad5 100644
--- a/artiq/coredevice/spi2.py
+++ b/artiq/coredevice/spi2.py
@@ -277,9 +277,8 @@ class NRTSPIMaster:
     def set_config_mu(self, flags=0, length=8, div=6, cs=1):
         """Set the ``config`` register.
 
-        Note that the non-realtime SPI cores are usually clocked by the system
-        clock and not the RTIO clock. In many cases, the SPI configuration is
-        already set by the firmware and you do not need to call this method.
+        In many cases, the SPI configuration is already set by the firmware
+        and you do not need to call this method.
         """
         spi_set_config(self.busno, flags, length, div, cs)