diff --git a/docs/custom-image.md b/docs/custom-image.md
index 2970dd042..eec127ce2 100644
--- a/docs/custom-image.md
+++ b/docs/custom-image.md
@@ -88,7 +88,7 @@ Ubuntu distributions.
 
 ```bash
 apt update
-apt install fio iperf iperf3 socat stress
+apt install fio iperf iperf3 socat stress cpuid
 ```
 
 ### Remove counterproductive packages