diff --git a/Documentation/wmi/driver-development-guide.rst b/Documentation/wmi/driver-development-guide.rst
index 99ef21fc1c1e..5680303ae314 100644
--- a/Documentation/wmi/driver-development-guide.rst
+++ b/Documentation/wmi/driver-development-guide.rst
@@ -54,6 +54,7 @@ to matching WMI devices using a struct wmi_device_id table:
 ::
 
   static const struct wmi_device_id foo_id_table[] = {
+         /* Only use uppercase letters! */
          { "936DA01F-9ABD-4D9D-80C7-02AF85C822A8", NULL },
          { }
   };
diff --git a/drivers/platform/x86/msi-wmi-platform.c b/drivers/platform/x86/msi-wmi-platform.c
index bd2687828a2e..e912fcc12d12 100644
--- a/drivers/platform/x86/msi-wmi-platform.c
+++ b/drivers/platform/x86/msi-wmi-platform.c
@@ -29,7 +29,7 @@
 
 #define DRIVER_NAME	"msi-wmi-platform"
 
-#define MSI_PLATFORM_GUID	"ABBC0F6E-8EA1-11d1-00A0-C90629100000"
+#define MSI_PLATFORM_GUID	"ABBC0F6E-8EA1-11D1-00A0-C90629100000"
 
 #define MSI_WMI_PLATFORM_INTERFACE_VERSION	2