-If this does not return empty your hosts CPU has support for PCID. If you use
-`host' as CPU type and the guest OS is able to use it, your done.
-Else, the PCID CPU flag needs to get set for the virtual CPU. This can be done,
-for example, by editing the CPU through the WebUI.
+If this does not return empty your host's CPU has support for 'pcid'.
+
+To check if the {pve} host supports spec-ctrl, execute the following command as root:
+
+----
+# grep ' spec_ctrl ' /proc/cpuinfo
+----
+
+If this does not return empty your host's CPU has support for 'spec-ctrl'.
+
+If you use `host' or another CPU type which enables the desired flags by
+default, and you updated your guest OS to make use of the associated CPU
+features, you're already set.
+
+Otherwise you need to set the desired CPU flag of the virtual CPU, either by
+editing the CPU options in the WebUI, or by setting the 'flags' property of the
+'cpu' option in the VM configuration file.