diff --git a/Documentation/firmware-guide/acpi/namespace.rst b/Documentation/firmware-guide/acpi/namespace.rst
index 835521baeb89..3eb763d6656d 100644
--- a/Documentation/firmware-guide/acpi/namespace.rst
+++ b/Documentation/firmware-guide/acpi/namespace.rst
@@ -261,7 +261,7 @@ Description Tables contain information used for the creation of the
 struct acpi_device objects represented by the given row (xSDT means DSDT
 or SSDT).
 
-The forth column of the above table indicates the 'bus_id' generation
+The fourth column of the above table indicates the 'bus_id' generation
 rule of the struct acpi_device object:
 
    _HID: