diff --git a/templates/default.yaml b/templates/default.yaml
index a652b0fa06b..92f077f3d07 100644
--- a/templates/default.yaml
+++ b/templates/default.yaml
@@ -534,6 +534,17 @@ guestInstallPrefix: null
 # 🟢 Builtin default: false
 plain: null
 
+# When the "nestedVirtualization" feature is enabled:
+# - Allows running a virtual machine inside the guest VM.
+# - Requires hardware and host support for nested virtualization.
+# - The guest VM must configure QEMU with the `-cpu host` parameters to enable proper functionality:
+#   qemu-system-aarch64 -accel kvm -cpu host -M virt -nographic -kernel vmlinuz-virt -initrd initramfs-virt
+# - Without this configuration, nested virtualization may fail with the error:
+#   qemu-system-aarch64: kvm_init_vcpu: kvm_arch_init_vcpu failed (0): Invalid argument
+# - Only supported on platforms where nested virtualization is explicitly enabled.
+# 🟢 Builtin default: false
+nestedVirtualization: null
+
 # ===================================================================== #
 # GLOBAL DEFAULTS AND OVERRIDES
 # ===================================================================== #