diff --git a/doc/source/reference/support-matrix.ini b/doc/source/reference/support-matrix.ini
index 0be1f1289fa..ffd1d72c179 100644
--- a/doc/source/reference/support-matrix.ini
+++ b/doc/source/reference/support-matrix.ini
@@ -395,9 +395,11 @@ driver.zadara=missing
 [operation.qos]
 title=QoS
 status=optional
-notes=Vendor drivers that support Quality of Service (QoS) are able
-  to utilize QoS Specs associated with volume extra specs to control
-  QoS settings on a per volume basis.
+notes=Vendor drivers that support Quality of Service (QoS) at the
+  backend. This means they are able to utilize QoS Specs associated
+  with volume extra specs to control QoS settings at the storage
+  device on a per volume basis. Drivers that don't support this can
+  utilize frontend QoS via libvirt.
 driver.datera=complete
 driver.dell_emc_powermax=complete
 driver.dell_emc_ps=missing
diff --git a/doc/source/reference/support-matrix.rst b/doc/source/reference/support-matrix.rst
index 0ef3a0083d6..d5d0795d813 100644
--- a/doc/source/reference/support-matrix.rst
+++ b/doc/source/reference/support-matrix.rst
@@ -53,6 +53,13 @@ matrix we include the list of required functions here for reference.
   Since the above functions are required their support is assumed and the
   matrix only includes support for optional functionality.
 
+.. note::
+  This matrix is not dynamically generated. It is maintained by the Cinder
+  team and Vendor driver maintainers. While every effort is made to ensure
+  the accuracy of the data in this matrix, discrepancies with actual
+  functionality are possible. Please refer to your vendor's support
+  documentation for additional information.
+
 .. _driver_support_matrix:
 
 .. support_matrix:: support-matrix.ini