diff --git a/readme.md b/readme.md
index 5f8860e..c8238b8 100644
--- a/readme.md
+++ b/readme.md
@@ -35,6 +35,7 @@ services:
         environment:
             DISK_SIZE: "16G"
             RAM_SIZE: "512M"
+            CPU_CORES: "1"
         devices:
             - /dev/kvm
         cap_add: