diff --git a/README.md b/README.md
index 82d79f3..c6b72c7 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,13 @@ This is a [known issue](https://github.com/Dasharo/dcu/issues/17).
 The script will save the UUID and Serial Number to the COREBOOT region and the
 logo to BOOTSPLASH region.
 
+> [!WARNING]
+> CAUTION: Using `smbios` subcommand to modify SMBIOS data in a firmware image is
+> allowed only on images without Boot Guard provisioning. Official Dasharo images
+> containing Boot Guard provisioning are marked with `_btg_provisioned` image file
+> name portion. Flashing `_btg_provisioned` image with modified SMBIOS data will
+> make the platform unusable & will require an external flashing recovery procedure.
+
 NOTE: Not all Dasharo platform support such customizations.
 
 NOTE: if you update the firmware by rewriting whole BIOS region, the data will